ID

VAR-201602-0004

CVE

CVE-2015-7547

TITLE

GNU glibc getaddrinfo () stack buffer overflow vulnerability

DESCRIPTION

Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc or libc6) before 2.23 allow remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted DNS response that triggers a call to the getaddrinfo function with the AF_UNSPEC or AF_INET6 address family, related to performing "dual A/AAAA DNS queries" and the libnss_dns.so.2 NSS module. GNU glibc is an open source C language compiler released under the LGPL license agreement. It is an implementation of the C library in the Linux operating system. There is a stack overflow vulnerability in the getaddrinfo function in glibc when processing a specific DNS response packet. An attacker can use the vulnerability to launch an attack on a Linux host or related devices by constructing a malicious DNS service or using a man-in-the-middle attack, which results in remote code execution and can be obtained. User terminal control. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Note: the current version of the following document is available here: https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_n a-c05028479 SUPPORT COMMUNICATION - SECURITY BULLETIN Document ID: c05028479 Version: 2 HPSBGN03442 rev.2 - HP Helion OpenStack using glibc, Remote Denial of Service (DoS), Arbitrary Code Execution NOTICE: The information in this Security Bulletin should be acted upon as soon as possible. Release Date: 2016-03-01 Last Updated: 2016-06-06 Potential Security Impact: Remote Arbitrary Code Execution, Denial of Service (DoS) Source: Hewlett Packard Enterprise, Product Security Response Team VULNERABILITY SUMMARY HPE Helion OpenStack has addressed stack based buffer overflows in glibc's implementation of getaddrinfo(). References: CVE-2015-7547 PSRT110041 SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. HP Helion OpenStack 1.1.1, 2.0.0, 2.1.0 BACKGROUND CVSS 2.0 Base Metrics =========================================================== Reference Base Vector Base Score CVE-2015-7547 (AV:N/AC:M/Au:N/C:P/I:P/A:P) 6.8 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002 RESOLUTION HPE has provided the following software update to resolve the vulnerability in HPE Helion OpenStack. For HPE Helion OpenStack 1.1.1: Helion OpenStack 1.1.1 customers should engage with HPE Helion Professional Services via existing support channels to assist with the upgrade. For HPE Helion OpenStack 2.0.x the recommended update path is to download and upgrade to Helion OpenStack 2.1.2 or a subsequent later version . This can be done as follows: Go to https://helion.hpwsportal.com and download HPE Helion OpenStack 2.1.2 Follow these http://docs.hpcloud.com/#helion/installation/upgrade20_to_212.html deployment steps to upgrade to 2.1.2 HPE Helion OpenStack 2.0.x customers can also choose to install the 2.0.2 release, which only includes the changes mentioned in the release notes http://docs.hpcloud.com/#helion/releasenotes202.html . This can be done as follows: Go to https://helion.hpwsportal.com and download HPE Helion OpenStack 2.0.2 Follow these http://docs.hpcloud.com/#helion/installation/upgrade20_to_202.html deployment steps to upgrade to 2.0.2 To patch HPE Helion OpenStack 2.1.0: Go to https://helion.hpwsportal.com and download HPE Helion OpenStack 2.1.2 or a subsequent later version . Follow these http://docs.hpcloud.com/#helion/installation/upgrade_to_212.html deployment steps to upgrade to 2.1.2 HISTORY Version:1 (rev.1) - 1 March 2016 Initial release Version:2 (rev.2) - 6 June 2016 Initial release Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy. Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HPE Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hpe.com. Report: To report a potential security vulnerability with any HPE supported product, send Email to: security-alert@hpe.com Subscribe: To initiate a subscription to receive future HPE Security Bulletin alerts via Email: http://www.hpe.com/support/Subscriber_Choice Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://www.hpe.com/support/Security_Bulletin_Archive Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB. 3C = 3COM 3P = 3rd Party Software GN = HPE General Software HF = HPE Hardware and Firmware MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PV = ProCurve ST = Storage Software UX = HP-UX Copyright 2016 Hewlett Packard Enterprise Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett Packard Enterprise and the names of Hewlett Packard Enterprise products referenced herein are trademarks of Hewlett Packard Enterprise in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. Red Hat Product Security has rated this update as having Critical security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: RHEL 7-based RHEV-H - noarch RHEV Hypervisor for RHEL-6 - noarch 3. Description: The rhev-hypervisor package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes everything necessary to run and manage virtual machines: A subset of the Red Hat Enterprise Linux operating environment and the Red Hat Enterprise Virtualization Agent. Note: Red Hat Enterprise Virtualization Hypervisor is only available for the Intel 64 and AMD64 architectures with virtualization extensions. A stack-based buffer overflow was found in the way the libresolv library performed dual A/AAAA DNS queries. Note: this issue is only exposed when libresolv is called from the nss_dns NSS service module. (CVE-2015-7547) This issue was discovered by the Google Security Team and Red Hat. Users of Red Hat Enterprise Virtualization Hypervisor are advised to upgrade to these updated packages. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 5. Package List: RHEV Hypervisor for RHEL-6: Source: rhev-hypervisor7-7.2-20160105.2.el6ev.src.rpm noarch: rhev-hypervisor6-6.7-20160104.2.el6ev.noarch.rpm rhev-hypervisor7-7.2-20160105.2.el6ev.noarch.rpm RHEL 7-based RHEV-H: Source: rhev-hypervisor7-7.2-20160105.2.el7ev.src.rpm noarch: rhev-hypervisor7-7.2-20160105.2.el7ev.noarch.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2015-7547 https://access.redhat.com/security/updates/classification/#critical https://access.redhat.com/articles/2161461 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-3480-1 security@debian.org https://www.debian.org/security/ Florian Weimer February 16, 2016 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : eglibc CVE ID : CVE-2014-8121 CVE-2015-1781 CVE-2015-7547 CVE-2015-8776 CVE-2015-8777 CVE-2015-8778 CVE-2015-8779 Debian Bug : 779587 796105 798316 801691 803927 812441 812445 812455 Several vulnerabilities have been fixed in the GNU C Library, eglibc. The CVE-2015-7547 vulnerability listed below is considered to have critical impact. CVE-2014-8121 Robin Hack discovered that the nss_files database did not correctly implement enumeration interleaved with name-based or ID-based lookups. This could cause the enumeration enter an endless loop, leading to a denial of service. CVE-2015-1781 Arjun Shankar discovered that the _r variants of host name resolution functions (like gethostbyname_r), when performing DNS name resolution, suffered from a buffer overflow if a misaligned buffer was supplied by the applications, leading to a crash or, potentially, arbitrary code execution. Most applications are not affected by this vulnerability because they use aligned buffers. CVE-2015-7547 The Google Security Team and Red Hat discovered that the eglibc host name resolver function, getaddrinfo, when processing AF_UNSPEC queries (for dual A/AAAA lookups), could mismanage its internal buffers, leading to a stack-based buffer overflow and arbitrary code execution. This vulnerability affects most applications which perform host name resolution using getaddrinfo, including system services. CVE-2015-8776 Adam Nielsen discovered that if an invalid separated time value is passed to strftime, the strftime function could crash or leak information. Applications normally pass only valid time information to strftime; no affected applications are known. CVE-2015-8777 Hector Marco-Gisbert reported that LD_POINTER_GUARD was not ignored for SUID programs, enabling an unintended bypass of a security feature. This update causes eglibc to always ignore the LD_POINTER_GUARD environment variable. CVE-2015-8778 Szabolcs Nagy reported that the rarely-used hcreate and hcreate_r functions did not check the size argument properly, leading to a crash (denial of service) for certain arguments. No impacted applications are known at this time. CVE-2015-8779 The catopen function contains several unbound stack allocations (stack overflows), causing it the crash the process (denial of service). No applications where this issue has a security impact are currently known. The following fixed vulnerabilities currently lack CVE assignment: Joseph Myers reported discovered that an integer overflow in the strxfrm can lead to heap-based buffer overflow, possibly allowing arbitrary code execution. In addition, a fallback path in strxfrm uses an unbounded stack allocation (stack overflow), leading to a crash or erroneous application behavior. Kostya Serebryany reported that the fnmatch function could skip over the terminating NUL character of a malformed pattern, causing an application calling fnmatch to crash (denial of service). Joseph Myers reported that the IO_wstr_overflow function, internally used by wide-oriented character streams, suffered from an integer overflow, leading to a heap-based buffer overflow. On GNU/Linux systems, wide-oriented character streams are rarely used, and no affected applications are known. Andreas Schwab reported a memory leak (memory allocation without a matching deallocation) while processing certain DNS answers in getaddrinfo, related to the _nss_dns_gethostbyname4_r function. This vulnerability could lead to a denial of service. While it is only necessary to ensure that all processes are not using the old eglibc anymore, it is recommended to reboot the machines after applying the security upgrade. For the oldstable distribution (wheezy), these problems have been fixed in version 2.13-38+deb7u10. We recommend that you upgrade your eglibc packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJWwy2CAAoJEAVMuPMTQ89EEk4P/jEoKqrIFx5+K5titipnU0wq jASxI7dQdvHz91CKl47mPfdzvnuH6MRHWzCNz6ngsSRLhqxQhF66beeIAI+EMoGx BzA9/WtpieNl80vWrmPRDuqf0kwFjxkzUI50jeQ2KoSZuP9AOGrlMG1olDL9dvDz W7avzgXZcd4JQ1W3A8cdfVQEOPZiszjap26CCtxmINRfigSDr25F5WMvY64DtNO7 SKDen2QOXhHoz5TdQJDq3PzuWqGppMq2ENSTuTH+1W94MJLQVSHglNo8uLBSuT8G Hd06TdA2SBB5E2V5i1BM1+z0++9LzBn2YzVIFY8AYTtksAiQcEDZS4swVA/r4aEK gHfgoAC/WcxvPxSMC9gJDx83b1JpB6Wnn9k8SIMBpEdAAJeWIjwFXyhzfO88G9ig l6dgCIAuTJLPCgiT/virNQFLJI0gilyKwSxx5UHv03Nfi03EXU1R/6cX+KllPzFZ N5mkR76MrL/hjDkdA0G494ubO6NDaDGCDgzMiLaP+Y6sDcF5ChmYMdJfji5f8AD8 kqEnTrL7B3/x9ePFg6gEAcmyzwJ8/Utg8c7Wmpc+LaK6OWN9QC79HSRYiIitNGIv 7NvHxPcLZn35pEhv68EwgKpmCa61EjFRrIGRcfRPDP8Yf08JEWm2q/zY9+XhBwDG edY4CgwM3CLvMCOl/4r2 =K3Zo -----END PGP SIGNATURE----- . ============================================================================ Ubuntu Security Notice USN-2900-1 February 16, 2016 eglibc, glibc vulnerability ============================================================================ A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.10 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS Summary: GNU C Library could be made to crash or run programs if it received specially crafted network traffic. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: libc6 2.21-0ubuntu4.1 Ubuntu 14.04 LTS: libc6 2.19-0ubuntu6.7 Ubuntu 12.04 LTS: libc6 2.15-0ubuntu10.13 After a standard system update you need to reboot your computer to make all the necessary changes. SEC Consult Vulnerability Lab Security Advisory < 20190904-0 > ======================================================================= title: Multiple vulnerabilities product: Cisco RV340, Cisco RV340W, Cisco RV345, Cisco RV345P, Cisco RV260, Cisco RV260P, Cisco RV260W, Cisco 160, Cisco 160W vulnerable version: Cisco RV34X - 1.0.02.16, Cisco RV16X/26X - 1.0.00.15 fixed version: see "Solution" CVE number: - impact: High homepage: https://www.cisco.com/ found: 2019-05-15 by: T. Weber, S. Viehböck (Office Vienna) IoT Inspector SEC Consult Vulnerability Lab An integrated part of SEC Consult Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Securely connecting your small business to the outside world is as important as connecting your internal network devices to one another. Cisco Small Business RV Series Routers offer virtual private networking (VPN) technology so your remote workers can connect to your network through a secure Internet pathway." Source: https://www.cisco.com/c/en/us/products/routers/small-business-rv-series-routers/index.html Business recommendation: ------------------------ We want to thank Cisco for the very quick and professional response and great coordination. Customers are urged to update the firmware of their devices. Vulnerability overview/description: ----------------------------------- 1) Hardcoded Credentials The device contains hardcoded users and passwords which can be used to login via SSH on an emulated device at least. During the communication with Cisco it turned out that: "Accounts like the 'debug-admin' and 'root' can not be accessed from console port, CLI or webui". Therefore, these accounts had no real functionality and cannot be used for malicious actions. 2) Known GNU glibc Vulnerabilities The used GNU glibc in version 2.19 is outdated and contains multiple known vulnerabilities. The outdated version was found by IoT Inspector. One of the discovered vulnerabilities (CVE-2015-7547, "getaddrinfo() buffer overflow") was verified by using the MEDUSA scalable firmware runtime. 3) Known BusyBox Vulnerabilities The used BusyBox toolkit in version 1.23.2 is outdated and contains multiple known vulnerabilities. The outdated version was found by IoT Inspector. One of the discovered vulnerabilities (CVE-2017-16544) was verified by using the MEDUSA scaleable firmware runtime. 4) Multiple Vulnerabilities - IoT Inspector Report Further information can be found in IoT Inspector report: https://r.sec-consult.com/ciscoiot Proof of concept: ----------------- 1) Hardcoded Credentials The following hardcoded hashes were found in the 'shadow' file of the firmware: root:$1$hPNSjUZA$7eKqEpqVYltt9xJ6f0OGf0:15533:0:99999:7::: debug-admin:$1$.AAm0iJ4$na9wZwly9pSrdS8MhcGKw/:15541:0:99999:7::: [...] The undocumented user 'debug-admin' is also contained in this file. Starting the dropbear daemon as background process on emulated firmware: ------------------------------------------------------------------------------- # dropbear -E # [1109] <timestamp> Running in background # # [1112] <timestamp> Child connection from <IP>:52718 [1112] <timestamp> /var must be owned by user or root, and not writable by others [1112] <timestamp> Password auth succeeded for 'debug-admin' from <IP>:52718 ------------------------------------------------------------------------------- Log on via another host connected to the same network. For this PoC the password of the debug-admin was changed in the 'shadow' file. ------------------------------------------------------------------------------- [root@localhost medusa]# ssh debug-admin@<IP> /bin/ash -i debug-admin@<IP>'s password: /bin/ash: can't access tty; job control turned off BusyBox v1.23.2 (2018-11-21 18:22:56 IST) built-in shell (ash) /tmp $ ------------------------------------------------------------------------------- The 'debug-admin' user has the same privileges like 'root'. This can be determined from the corresponding sudoers file in the firmware: [...] ## User privilege specification ## root ALL=(ALL) ALL debug-admin ALL=(ALL) ALL ## Uncomment to allow members of group wheel to execute any command # %wheel ALL=(ALL) ALL [...] During the communication with Cisco it turned out that: "Accounts like the 'debug-admin' and 'root' can not be accessed from console port, CLI or webui". Therefore, these accounts had no real functionality and cannot be used for malicious actions. 2) Known GNU glibc Vulnerabilities GNU glibc version 2.19 contains multiple CVEs like: CVE-2014-4043, CVE-2014-9402, CVE-2014-9761, CVE-2014-9984, CVE-2015-1472, CVE-2015-5277, CVE-2015-8778, CVE-2015-8779, CVE-2017-1000366 and more. The getaddrinfo() buffer overflow vulnerability was checked with the help of the exploit code from https://github.com/fjserna/CVE-2015-7547. It was compiled and executed on the emulated device to test the system. # python cve-2015-7547-poc.py & [1] 961 # chroot /medusa_rootfs/ bin/ash BusyBox v1.23.2 (2018-11-21 18:22:56 IST) built-in shell (ash) # gdb cve-2015-7547_glibc_getaddrinfo [...] [UDP] Total Data len recv 36 [UDP] Total Data len recv 36 Connected with 127.0.0.1:41782 [TCP] Total Data len recv 76 [TCP] Request1 len recv 36 [TCP] Request2 len recv 36 Cannot access memory at address 0x4 Program received signal SIGSEGV, Segmentation fault. 0x76f1fd58 in ?? () from /lib/libc.so.6 (gdb) References: https://security.googleblog.com/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html https://github.com/fjserna/CVE-2015-7547 3) Known BusyBox Vulnerabilities BusyBox version 1.23.2 contains multiple CVEs like: CVE-2016-2148, CVE-2016-6301, CVE-2015-9261, CVE-2016-2147, CVE-2018-20679, CVE-2017-16544 and CVE-2019-5747. The BusyBox shell autocompletion vulnerability (CVE-2017-16544) was verified on an emulated device: A file with the name "\ectest\n\e]55;test.txt\a" was created to trigger the vulnerability. ------------------------------------------------------------------------------- # ls "pressing <TAB>" test ]55;test.txt # ------------------------------------------------------------------------------- 4) Multiple Vulnerabilities - IoT Inspector Report Further information can be found in IoT Inspector report: https://r.sec-consult.com/ciscoiot The summary is below: IoT Inspector Vulnerability #1 BusyBox CVE entries Outdated BusyBox version is affected by 7 published CVEs. IoT Inspector Vulnerability #2 curl CVE entries Outdated curl version is affected by 35 published CVEs. IoT Inspector Vulnerability #3 GNU glibc CVE entries Outdated GNU glibc version is affected by 44 published CVEs. IoT Inspector Vulnerability #4 GNU glibc getaddrinfo() buffer overflow Outdated GNU glibc version is affected by CVE-2015-7547. IoT Inspector Vulnerability #5 Hardcoded password hashes Firmware contains multiple hardcoded credentials. IoT Inspector Vulnerability #6 Linux Kernel CVE entries Outdated Linux Kernel version affected by 512 published CVEs. IoT Inspector Vulnerability #7 MiniUPnPd CVE entries Outdated MiniUPnPd version affected by 2 published CVEs. IoT Inspector Vulnerability #8 Dnsmasq CVE entries Outdated MiniUPnPd version affected by 1 published CVE. IoT Inspector Vulnerability #9 Linux Kernel Privilege Escalation “pp_key” Outdated Linux Kernel version is affected by CVE-2015-7547. IoT Inspector Vulnerability #10 OpenSSL CVE entries Outdated OpenSSL version affected by 6 published CVEs. Vulnerable / tested versions: ----------------------------- The following firmware versions have been tested with IoT Inspector and firmware emulation techniques: Cisco RV340 / 1.0.02.16 Cisco RV340W / 1.0.02.16 Cisco RV345 / 1.0.02.16 Cisco RV345P / 1.0.02.16 The following firmware versions have been tested with IoT Inspector only: Cisco RV260 / 1.0.00.15 Cisco RV260P / 1.0.00.15 Cisco RV260W / 1.0.00.15 Cisco RV160 / 1.0.00.15 Cisco RV160P / 1.0.00.15 The firmware was obtained from the vendor website: https://software.cisco.com/download/home/286287791/type/282465789/release/1.0.02.16 https://software.cisco.com/download/home/286316464/type/282465789/release/1.0.00.15 Vendor contact timeline: ------------------------ 2019-05-15: Contacting vendor through psirt@cisco.com. 2019-05-16: Vendor confirmed the receipt. 2019-05-2019-08: Periodic updates about the investigation from the vendor. Clarification which of the reported issues will be fixed. 2019-08-20: The vendor proposed the next possible publication date for the advisory for 2019-09-04. The vendor added the RV160 and RV260 router series to be vulnerable to the same issues too. 2019-09-04: Coordinated advisory release. Solution: --------- Upgrade to the newest available firmware version. Additionally, the vendor provides the following security notice: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190904-sb-vpnrouter Workaround: ----------- None. Advisory URL: ------------- https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/career/index.html Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/contact/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF T. Weber / @2019

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

overflow, arbitrary

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

HP

SOURCES

LAST UPDATE DATE

2025-05-02T20:31:16.850000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE