ID

VAR-201706-0988

CVE

CVE-2017-8836

TITLE

plural Peplink Balance Cross-site request forgery vulnerability in device product firmware

DESCRIPTION

CSRF exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.1-build2093. The CGI scripts in the administrative interface are affected. This allows an attacker to execute commands, if a logged in user visits a malicious website. This can for example be used to change the credentials of the administrative webinterface. plural Peplink Balance Device product firmware contains a cross-site request forgery vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. PeplinkBalance305 is a multi-export load balancing router for medium-sized enterprises. A cross-site request forgery vulnerability exists in various PeplinkBalance products using firmware versions prior to fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_500hw3_1350hw2_2500-7.0.1-build2093. This vulnerability stems from the protection of CGI scripts from the management interface from cross-site request forgery attacks. Peplink Balance 305 etc. The following products are affected: Peplink Balance 305; 380; 580; 710; 1350; 2500. X41 D-Sec GmbH Security Advisory: X41-2017-005 Multiple Vulnerabilities in peplink balance routers =================================================== Overview -------- Confirmed Affected Versions: 7.0.0-build1904 Confirmed Patched Versions: fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.1-build2093.bin Vulnerable Firmware: fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.0-build1904.bin Models: Balance Routers 305, 380, 580, 710, 1350, 2500 Vendor: Peplink Vendor URL: https://www.peplink.com/ Vector: Network Credit: X41 D-Sec GmbH, Eric Sesterhenn Additional Credits: Claus Overbeck (Abovo IT) Status: Public Advisory-URL: https://www.x41-dsec.de/lab/advisories/x41-2017-005-peplink/ Summary and Impact ------------------ Several issues have been identified, which allow attackers to access the administrative web interface with admin credentials, delete files, perform CSRF and XSS attacks. Product Description ------------------- From the vendor webpage: Use Load Balancing and SpeedFusion bandwidth bonding to deliver superfast VoIP, video streaming, and data using an SD-WAN enabled network. Even with a basic Balance 20 dual-WAN router, you can mix different transport technologies and providers to keep your network up when individual links go down. Switching between links is automatic and seamless. SQL Injection via bauth Cookie ============================== Severity Rating: Critical Vector: Network CVE: CVE-2017-8835 CWE: 89 CVSS Score: 9.8 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Summary and Impact ------------------ Peplink devices are vulnerable to an SQL injection attack via the bauth cookie parameter which is set e.g. when accessing https://ip/cgi-bin/MANGA/admin.cgi. The injection can be checked with the following command: ./sqlmap.py -u "https://ip/cgi-bin/MANGA/admin.cgi" --cookie="bauth=csOWLxU4BvoMfhY2rHLVFm1EmZWV74zinla9IVclqrYxH16426647" -p"bauth" --level 5 --risk 3 --dbms sqlite --technique=BEUSQ --flush-session -t trace.log --prefix "'" --suffix "--" -a The vulnerability in the Peplink device allows to access the SQLite session database containing user and session variables. By using the the following cookie in a web request, it is possible to select a running administrator session to be used for the attackers login. bauth=-12' or id IN (select s.id from sessions as s left join sessionsvariables as v on v.id=s.id where v.name='rwa' and v.value='1') or '1'='2 By forming specialised SQL queries, it is possible to retrieve usernames from the database. This worked by returning a valid session in case the username existed and no session if it did not exist. In the first case the server did not set a new session cookie in the response to the request. SELECT id FROM sessions WHERE sessionid = '-14' or id IN (select s.id from sessions as s left join sessionsvariables as v on v.id=s.id where v.name='username' and substr(v.value,1,3)='adm') Workarounds ----------- Install vendor supplied update. Workarounds ----------- Install vendor supplied update. Passwords stored in Cleartext ============================= Severity Rating: Medium Vector: Network CVE: CVE-2017-8837 CWE: 256 CVSS Score: 4.0 CVSS Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Summary and Impact ------------------ The Peplink devices store passwords in cleartext in the files /etc/waipass and /etc/roapass. In case one of these devices is compromised the attacker can gain access to the cleartext passwords and abuse them to compromise further systems. Workarounds ----------- Install vendor supplied update. XSS via syncid Parameter ======================== Severity Rating: Medium Vector: Network CVE: CVE-2017-8838 CWE: 80 CVSS Score: 5.4 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Summary and Impact ------------------ If the webinterface is accessible, it is possible to abuse the syncid parameter to trigger a cross-site-scripting issue by calling https://ip/cgi-bin/HASync/hasync.cgi?debug=1&syncid=123%3Cscript%3Ealert%281%29%3C/script%3E This executes the JavaScript in the victims browser, which can be abused to steal session cookies. Workarounds ----------- Install vendor supplied update. XSS via preview.cgi =================== Severity Rating: Medium Vector: Network CVE: CVE-2017-8839 CWE: 80 CVSS Score: 5.4 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Summary and Impact ------------------ If the webinterface is accessible, it is possible to abuse the the orig_url parameter to trigger a cross-site-scripting issue in /guest/preview.cgi. The injection is directly into existing JavaScript. This executes the JavaScript in the victims browser, which can be abused to steal session cookies. Workarounds ----------- Install vendor supplied update. File Deletion ============= Severity Rating: Medium Vector: Network CVE: CVE-2017-8841 CWE: 73 CVSS Score: 6.5 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H Summary and Impact ------------------ A logged in user can delete arbitrary files on the Peplink devices, by abusing the /cgi-bin/MANGA/firmware_process.cgi. When an absolute path is provided to the upfile.path parameter the file provided in the path is deleted during the process. This can be abused to cause a denial of service (DoS). In combination with the missing CSRF protection, this can be abused remotely via a logged in user. Workarounds ----------- Install vendor supplied update. Information Disclosure ====================== Severity Rating: Medium Vector: Network CVE: CVE-2017-8840 CWE: 200 CVSS Score: 5.3 CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Summary and Impact ------------------ If the webinterface is accessible, it is possible to retrieve sensitive information without a valid login by opening cgi-bin/HASync/hasync.cgi?debug=1 This displays the following: -----8<------------------------------------------------ Master LAN Address = [ <internal ip> / <netmask> ] Serial Number = [ <serial number> ] HA Group ID = [ <group id> ] Virtual IP = [ <internal ip> / <netmask> ] Submitted syncid = [ <syncid> ] -----8<------------------------------------------------ This information can be valuable for an attacker to exploit other issues. Workarounds ----------- Install vendor supplied update. About X41 D-Sec GmbH -------------------- X41 D-Sec is a provider of application security services. We focus on application code reviews, design review and security testing. X41 D-Sec GmbH was founded in 2015 by Markus Vervier. We support customers in various industries such as finance, software development and public institutions. Timeline -------- 2017-04-07 Issue found 2017-04-10 Vendor asked for security contact 2017-04-11 Vendor replied, send GPG key 2017-04-11 Information supplied to vendor 2017-04-11 Vendor acknowledges that the information is received 2017-04-17 Vendor acknowledges SQL injection 2017-05-08 CVE IDs for all issues requested 2017-05-08 CVE IDs assigned 2017-05-11 Vendor informed about CVE IDs 2017-05-29 Version provided to X41 for testing 2017-05-31 First test results send back to the vendor 2017-06-01 Remaining test results send back to the vendor 2017-06-05 Coordinated Firmware and Advisory release -- X41 D-SEC GmbH, Dennewartstr. 25-27, D-52068 Aachen T: +49 241 9809418-0, Fax: -9 Unternehmenssitz: Aachen, Amtsgericht Aachen: HRB19989 GeschA$?ftsfA1/4hrer: Markus Vervier

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

cross-site request forgery

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Eric Sesterhenn, Claus Overbeck

SOURCES

LAST UPDATE DATE

2025-04-20T23:19:55.521000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE