SB2010090810 - Input validation error in Linux kernel
Published: September 8, 2010
Security Bulletin ID
SB2010090810
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2010-2524)
The vulnerability allows a local user to execute arbitrary code.
The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG_CIFS_DFS_UPCALL is enabled, relies on a user's keyring for the dns_resolver upcall in the cifs.upcall userspace helper, which allows local users to spoof the results of DNS queries and perform arbitrary CIFS mounts via vectors involving an add_key call, related to a 'cache stuffing' issue and MS-DFS referrals.
Remediation
Install update from vendor's website.
References
- http://marc.info/?l=oss-security&m=128080755321157&w=2
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35
- http://marc.info/?l=oss-security&m=128078387328921&w=2
- https://bugzilla.redhat.com/show_bug.cgi?id=612166
- http://marc.info/?l=oss-security&m=128072090331700&w=2
- http://www.redhat.com/support/errata/RHSA-2010-0610.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:172
- http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00004.html
- http://www.ubuntu.com/usn/USN-1000-1
- http://www.vmware.com/security/advisories/VMSA-2011-0003.html
- http://secunia.com/advisories/43315
- http://www.securityfocus.com/archive/1/516397/100/0/threaded
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7