ID

VAR-201507-0348

CVE

CVE-2015-1793

TITLE

OpenSSL Vulnerabilities in certificate chain validation failure

DESCRIPTION

The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate. OpenSSL Contains a certificate chain validation flaw. 2015 Year 7 Moon 9 Day, OpenSSL Project Than OpenSSL Security Advisory [9 Jul 2015] Has been published. OpenSSL Security Advisory [9 Jul 2015] https://www.openssl.org/news/secadv_20150709.txt According to the advisory, the following vulnerabilities have been fixed: OpenSSL 1.0.2d , 1.0.1p Has been released. Severity − High (Severity: High) ･ Alternative chains certificate forgery (CVE-2015-1793) OpenSSL Tries to build an alternative certificate chain if the certificate validation fails to build the first certificate chain, but there is a flaw in the implementation of this process. As a result, for example CA Flag FALSE A certificate issued using a certificate that is considered to be trusted is not detected as being invalid. CA May be treated as a certificate issued by.Man-in-the-middle attacks (man-in-the-middle attack) By HTTPS The contents of the communication may be viewed or altered. OpenSSL is prone to a security-bypass vulnerability because the application fails to properly verify SSL, TLS, and DTLS certificates. Successfully exploiting this issue allows attackers to perform man-in-the-middle attacks and bypass certain security restrictions. This may aid in further attacks. OpenSSL versions 1.0.2c, 1.0.2b, 1.0.1n, and 1.0.1o are vulnerable. It supports a variety of encryption algorithms, including symmetric ciphers, hash algorithms, security hashing algorithm, etc. There is a security vulnerability in the TLS protocol 1.2 and earlier versions. The vulnerability comes from that when the server enables the DHE_EXPORT cipher suite, the program does not pass the DHE_EXPORT option correctly. Attackers can exploit this vulnerability to implement man-in-the-middle attacks and cipher-downgrade attacks by rewriting ClientHello (use DHE_EXPORT instead of DHE) and then rewrite ServerHello (use DHE instead of DHE_EXPORT). -----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_na-c04760669 SUPPORT COMMUNICATION - SECURITY BULLETIN Document ID: c04760669 Version: 1 HPSBUX03388 SSRT102180 rev.1 - HP-UX running OpenSSL, Remote Disclosure of Information NOTICE: The information in this Security Bulletin should be acted upon as soon as possible. Release Date: 2015-08-05 Last Updated: 2015-08-05 Potential Security Impact: Remote disclosure of information Source: Hewlett-Packard Company, HP Software Security Response Team VULNERABILITY SUMMARY A potential security vulnerability has been identified with HP-UX running OpenSSL with SSL/TLS enabled. This is the TLS vulnerability using US export-grade 512-bit keys in Diffie-Hellman key exchange known as Logjam which could be exploited remotely resulting in disclosure of information. References: CVE-2015-4000: DHE man-in-the-middle protection (Logjam). CVE-2015-1788: Malformed ECParameters causes infinite loop. CVE-2015-1789: Exploitable out-of-bounds read in X509_cmp_time. CVE-2015-1790: PKCS7 crash with missing EnvelopedContent CVE-2015-1791: Race condition handling NewSessionTicket CVE-2015-1792: CMS verify infinite loop with unknown hash function CVE-2015-1793: Alternative Chain Certificate Forgery. BACKGROUND CVSS 2.0 Base Metrics =========================================================== Reference Base Vector Base Score CVE-2015-4000 (AV:N/AC:M/Au:N/C:N/I:P/A:N) 4.3 CVE-2015-1788 (AV:N/AC:M/Au:N/C:N/I:N/A:P) 4.3 CVE-2015-1789 (AV:N/AC:M/Au:N/C:N/I:N/A:P) 4.3 CVE-2015-1790 (AV:N/AC:L/Au:N/C:N/I:N/A:P) 5.0 CVE-2015-1791 (AV:N/AC:M/Au:N/C:P/I:P/A:P) 6.8 CVE-2015-1792 (AV:N/AC:L/Au:N/C:N/I:N/A:P) 5.0 CVE-2015-1793 (AV:N/AC:L/Au:N/C:P/I:P/A:N) 6.4 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002 RESOLUTION HP has provided an updated version of OpenSSL to resolve this vulnerability. A new B.11.31 depot for OpenSSL_A.01.00.01p is available here: https://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber =OPENSSL11I MANUAL ACTIONS: Yes - Update PRODUCT SPECIFIC INFORMATION HP-UX Software Assistant: HP-UX Software Assistant is an enhanced application that replaces HP-UX Security Patch Check. It analyzes all Security Bulletins issued by HP and lists recommended actions that may apply to a specific HP-UX system. It can also download patches and create a depot automatically. For more information see: https://www.hp.com/go/swa The following text is for use by the HP-UX Software Assistant. AFFECTED VERSIONS HP-UX B.11.31 ================== openssl.OPENSSL-CER openssl.OPENSSL-CONF openssl.OPENSSL-DOC openssl.OPENSSL-INC openssl.OPENSSL-LIB openssl.OPENSSL-MAN openssl.OPENSSL-MIS openssl.OPENSSL-PRNG openssl.OPENSSL-PVT openssl.OPENSSL-RUN openssl.OPENSSL-SRC action: install revision A.01.00.01p or subsequent END AFFECTED VERSIONS HISTORY Version:1 (rev.1) - 5 August 2015 Initial release Third Party Security Patches: Third party security patches that are to be installed on systems running HP 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 HP Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hp.com. Report: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com Subscribe: To initiate a subscription to receive future HP Security Bulletin alerts via Email: http://h41183.www4.hp.com/signup_alerts.php?jumpid=hpsc_secbulletins Security Bulletin Archive: A list of recently released Security Bulletins is available here: https://h20564.www2.hp.com/portal/site/hpsc/public/kb/secBullArchive/ 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 = HP General Software HF = HP Hardware and Firmware MP = MPE/iX MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PI = Printing and Imaging PV = ProCurve ST = Storage Software TU = Tru64 UNIX UX = HP-UX Copyright 2015 Hewlett-Packard Development Company, L.P. Hewlett-Packard Company 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 Company and the names of Hewlett-Packard products referenced herein are trademarks of Hewlett-Packard Company in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEARECAAYFAlXCSD4ACgkQ4B86/C0qfVlKnQCg5XcK1amrTACEyDY3QtJF75u2 L90AnAgGXxSCZgBVzDQCAezbHbrHPwtg =74KM -----END PGP SIGNATURE----- . Here are the details from the Slackware 14.1 ChangeLog: +--------------------------+ patches/packages/openssl-1.0.1p-i486-1_slack14.1.txz: Upgraded. This update fixes the following security issue: Alternative chains certificate forgery (CVE-2015-1793). This issue will impact any application that verifies certificates including SSL/TLS/DTLS clients and SSL/TLS/DTLS servers using client authentication. This issue was reported to OpenSSL on 24th June 2015 by Adam Langley/David Benjamin (Google/BoringSSL). The fix was developed by the BoringSSL project. +--------------------------+ Where to find the new packages: +-----------------------------+ Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-) Also see the "Get Slack" section on http://slackware.com for additional mirror sites near you. Updated packages for Slackware 14.0: ftp://ftp.slackware.com/pub/slackware/slackware-14.0/patches/packages/openssl-1.0.1p-i486-1_slack14.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-14.0/patches/packages/openssl-solibs-1.0.1p-i486-1_slack14.0.txz Updated packages for Slackware x86_64 14.0: ftp://ftp.slackware.com/pub/slackware/slackware64-14.0/patches/packages/openssl-1.0.1p-x86_64-1_slack14.0.txz ftp://ftp.slackware.com/pub/slackware/slackware64-14.0/patches/packages/openssl-solibs-1.0.1p-x86_64-1_slack14.0.txz Updated packages for Slackware 14.1: ftp://ftp.slackware.com/pub/slackware/slackware-14.1/patches/packages/openssl-1.0.1p-i486-1_slack14.1.txz ftp://ftp.slackware.com/pub/slackware/slackware-14.1/patches/packages/openssl-solibs-1.0.1p-i486-1_slack14.1.txz Updated packages for Slackware x86_64 14.1: ftp://ftp.slackware.com/pub/slackware/slackware64-14.1/patches/packages/openssl-1.0.1p-x86_64-1_slack14.1.txz ftp://ftp.slackware.com/pub/slackware/slackware64-14.1/patches/packages/openssl-solibs-1.0.1p-x86_64-1_slack14.1.txz Updated packages for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/a/openssl-solibs-1.0.1p-i586-1.txz ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openssl-1.0.1p-i586-1.txz Updated packages for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/a/openssl-solibs-1.0.1p-x86_64-1.txz ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openssl-1.0.1p-x86_64-1.txz MD5 signatures: +-------------+ Slackware 14.0 packages: a77913257d9e4d9f0b143e7c2bf829d3 openssl-1.0.1p-i486-1_slack14.0.txz 9d778b2df5c01be05c5133d3c420a216 openssl-solibs-1.0.1p-i486-1_slack14.0.txz Slackware x86_64 14.0 packages: 1423b29d8621434363fcd92480544d19 openssl-1.0.1p-x86_64-1_slack14.0.txz e510fd37b65ab9b585f505c3b8925755 openssl-solibs-1.0.1p-x86_64-1_slack14.0.txz Slackware 14.1 packages: 483c52a8f52243486db12c6a85e59ad3 openssl-1.0.1p-i486-1_slack14.1.txz a2704397b9eabd509336dedfe1b51ff3 openssl-solibs-1.0.1p-i486-1_slack14.1.txz Slackware x86_64 14.1 packages: 2a4b0b930a7513a24a719f9996c3cd5d openssl-1.0.1p-x86_64-1_slack14.1.txz 3414a0e114c93ac4352938f182df5180 openssl-solibs-1.0.1p-x86_64-1_slack14.1.txz Slackware -current packages: a867679d8f4a29a7b206930840d8c92f a/openssl-solibs-1.0.1p-i586-1.txz 1e28db3e77d547ef338c7116cf8d415f n/openssl-1.0.1p-i586-1.txz Slackware x86_64 -current packages: f53454dd43f9d3206db58b9cd8b4e53e a/openssl-solibs-1.0.1p-x86_64-1.txz 4433713b6723a0715dc60d1254ee2ca3 n/openssl-1.0.1p-x86_64-1.txz Installation instructions: +------------------------+ Upgrade the packages as root: # upgradepkg openssl-1.0.1p-i486-1_slack14.1.txz openssl-solibs-1.0.1p-i486-1_slack14.1.txz +-----+ Slackware Linux Security Team http://slackware.com/gpg-key security@slackware.com +------------------------------------------------------------------------+ | To leave the slackware-security mailing list: | +------------------------------------------------------------------------+ | Send an email to majordomo@slackware.com with this text in the body of | | the email message: | | | | unsubscribe slackware-security | | | | You will get a confirmation message back containing instructions to | | complete the process. Please do not reply to this email address. Resolution ========== All OpenSSL users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.1p" References ========== [ 1 ] CVE-2015-1793 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1793 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201507-15 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2015 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5 . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-15:12.openssl Security Advisory The FreeBSD Project Topic: OpenSSL alternate chains certificate forgery vulnerability Category: contrib Module: openssl Announced: 2015-07-09 Credits: Adam Langley/David Benjamin (Google/BoringSSL), OpenSSL Affects: FreeBSD 10.1-STABLE after 2015-06-11 and prior to the correction date. Corrected: 2015-07-09 17:17:22 UTC (stable/10, 10.2-PRERELEASE, 10.2-BETA1) CVE Name: CVE-2015-1793 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. II. An error in the implementation of this logic could erroneously mark certificate as trusted when they should not. III. IV. Workaround No workaround is available. NOTE WELL: This issue does not affect earlier FreeBSD releases, including the supported 8.4, 9.3 and 10.1-RELEASE because the alternative certificate chain feature was not introduced in these releases. Only 10.1-STABLE after 2015-06-11 and prior to the correction date is affected. V. Solution Upgrade your vulnerable system to the latest supported FreeBSD stable/10 branch dated after the correction date. Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. Restart all deamons using the library, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/10/ r285330 - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. Note ==== As per our previous announcements and our Release Strategy (https://www.openssl.org/about/releasestrat.html), support for OpenSSL versions 1.0.0 and 0.9.8 will cease on 31st December 2015. No security updates for these releases will be provided after that date. Users of these releases are advised to upgrade. References ========== URL for this Security Advisory: https://www.openssl.org/news/secadv_20150709.txt Note: the online version of the advisory may be updated with additional details over time. For details of OpenSSL severity classifications please see: https://www.openssl.org/about/secpolicy.html

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

Input Validation Error

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH