CVE-2010-2524

Published: 8 September 2010

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.

From the Ubuntu Security Team

David Howells discovered that DNS resolution in CIFS could be spoofed. A local attacker could exploit this to control DNS replies, leading to a loss of privacy and possible privilege escalation.

Notes

according to oss-security discussion, git commit 6103335de8afa5d780dcd512abe85c696af7b040
introduced the problem, so 2.6.25-rc1 onwards.

Jaunty *may* be affected, but the problem is that there is no infra-
structure for thread credentials, so even if it is possible to back-
port the whole thing it would be completely different and prone to
be incorrect. That together with the fact that Jaunty is EOL more or
less I don't think we should put in much effort there.

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2524
• https://ubuntu.com/security/notices/USN-1000-1
• https://ubuntu.com/security/notices/USN-1074-1
• https://ubuntu.com/security/notices/USN-1074-2
• https://ubuntu.com/security/notices/USN-1083-1
• NVD
• Launchpad
• Debian