CVE-2010-2524
Published: 08 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.
Priority
Medium
CVSS 3 base score: 7.8
Status
| Package | Release | Status |
|---|---|---|
|
linux Launchpad, Ubuntu, Debian |
Upstream |
Released
(2.6.35)
|
|
Patches: upstream: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7 Karmic: http://chinstrap.ubuntu.com/~smb/CVEs/CVE-2010-2524/patches/karmic/linux/0001-CIFS-Fix-a-malicious-redirect-problem-in-the-DNS-looku.txt |
||
|
linux-ec2 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
|
linux-fsl-imx51 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
|
linux-lts-backport-maverick Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
|
linux-source-2.6.15 Launchpad, Ubuntu, Debian |
Upstream |
Needs triage
|
Notes
| Author | Note |
|---|---|
| sbeattie | according to oss-security discussion, git commit 6103335de8afa5d780dcd512abe85c696af7b040 introduced the problem, so 2.6.25-rc1 onwards. |
| smb | 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. |