YaBB .vars file privilege escalation
| yabb-vars-privilege-escalation (34848) |  Medium Risk |
Description:
YaBB (Yet Another Bulletin Board) could allow a remote attacker to gain elevated privileges on the application caused by improper validation of user-supplied input when writing to the .vars file. An attacker could exploit this vulnerability by injecting special characters into various form fields when creating a new profile or updating an existing user profile, which could allow the attacker to gain YaBB administrative privileges. Once administrative privileges are obtained, an attacker could further exploit this vulnerability to execute arbitrary code on the system with the privileges of the Web server process by submitting modified templates.
Platforms Affected:
- YaBB, YaBB 2.1 and prior
Remedy:
Apply patch available from the YaBB Forum Web site. See References.
Consequences:
Gain Privileges
References:
- iDefense Labs PUBLIC ADVISORY: 06.12.07, YaBB Forum member.vars CRLF Injection Privilege Escalation Vulnerability at http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=538.
- YaBB Forum Web site, Security Vulnerability in YaBB 2.1 - Patch at http://www.yabbforum.com/community/?board=general;action=display;num=1181678785.
- Yet another Bulletin Board - YaBB! Web site, latest YaBB news at http://www.yabbforum.com/.
- BID-24455: YaBB Forum Profile CRLF Injection Remote Privilege Escalation Vulnerability
- CVE-2007-3208: CRLF injection vulnerability in Yet another Bulletin Board (YaBB) 2.1 allows remote attackers to obtain administrative access via requests to (1) register.pl or (2) profile.pl that write CRLF sequences to a .vars file. NOTE: this can be leveraged to execute arbitrary code.
- SA25656: YaBB CRLF Injection Privilege Escalation Vulnerability
- SECTRACK ID: 1018236: YaBB `member.vars` File Lets Remote Users Gain Administrative Privileges
Reported:
Jun 12, 2007
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