The addmntent function in the GNU C Library (aka glibc or libc6) 2.13 and earlier does not report an error status for failed attempts to write to the /etc/mtab file, which makes it easier for local users to trigger corruption of this file, as demonstrated by writes from a process with a small RLIMIT_FSIZE value, a different vulnerability than CVE-2010-0296.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-1089
• https://bugzilla.redhat.com/show_bug.cgi?id=688980
• http://openwall.com/lists/oss-security/2011/03/04/10
• http://openwall.com/lists/oss-security/2011/03/04/11
• http://openwall.com/lists/oss-security/2011/03/04/12
• http://openwall.com/lists/oss-security/2011/03/04/9
• http://openwall.com/lists/oss-security/2011/03/05/3
• http://openwall.com/lists/oss-security/2011/03/05/7
• http://openwall.com/lists/oss-security/2011/03/07/9
• http://openwall.com/lists/oss-security/2011/03/14/16
• http://openwall.com/lists/oss-security/2011/03/14/5
• http://openwall.com/lists/oss-security/2011/03/14/7
• http://openwall.com/lists/oss-security/2011/03/15/6
• http://openwall.com/lists/oss-security/2011/03/22/4
• http://openwall.com/lists/oss-security/2011/03/22/6
• http://openwall.com/lists/oss-security/2011/03/31/3
• http://openwall.com/lists/oss-security/2011/03/31/4
• http://openwall.com/lists/oss-security/2011/04/01/2
• http://sourceware.org/bugzilla/show_bug.cgi?id=12625
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:178
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:179
• http://www.redhat.com/support/errata/RHSA-2011-1526.html
• http://www.securityfocus.com/bid/46740