grsecurity Role-Based Access Control (RBAC) security bypass
| grsecurity-rbac-security-bypass (41952) |  Low Risk |
Description:
grsecurity could allow a local attacker to bypass security restrictions, caused by an error in the user_transition_deny and user_transition_allow Role-Based Access Control (RBAC) system rules. An attacker could exploit this vulnerability via calls to sys_setfsuid() and sys_setfsgid() to bypass RBAC system rules.
Platforms Affected:
- grsecurity, grsecurity
Remedy:
Upgrade to the latest version of grsecurity (2.1.11-2.6.24.5 or 2.1.11-2.4.36.2 or later), available from the grsecurity Download Web site. See References.
Consequences:
Bypass Security
References:
- grsecurity Download Web site, grsecurity-2.1.11-2.4.36.2-200804211830.patch.gz at http://www.grsecurity.org/download.php.
- grsecurity News Web site, [04/21] grsecurity 2.1.11 patches updated, 2.6.24.5 supported at http://www.grsecurity.org/news.php.
- BID-28889: grsecurity Multiple RBAC Local Security Bypass Vulnerabilities
- CVE-2008-1940: The RBAC functionality in grsecurity before 2.1.11-2.6.24.5 and 2.1.11-2.4.36.2 does not enforce user_transition_deny and user_transition_allow rules for the (1) sys_setfsuid and (2) sys_setfsgid calls, which allows local users to bypass restrictions for those calls.
- SA29899: grsecurity RBAC User Transition Security Issue
- SECTRACK ID: 1019919: grsecurity Lets Local Users Bypass Role Based Access Control Rules
- VUPEN/ADV-2008-1323: grsecurity RBAC User Transition Rules Local Security Bypass Issue
Reported:
Apr 21, 2008
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