#VU94166 Input validation error in Linux kernel - CVE-2010-2524

Vulnerability identifier: #VU94166

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2010-2524

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://marc.info/?l=oss-security&m=128080755321157&w=2
https://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35
https://marc.info/?l=oss-security&m=128078387328921&w=2
https://bugzilla.redhat.com/show_bug.cgi?id=612166
https://marc.info/?l=oss-security&m=128072090331700&w=2
https://www.redhat.com/support/errata/RHSA-2010-0610.html
https://www.mandriva.com/security/advisories?name=MDVSA-2010:172
https://lists.opensuse.org/opensuse-security-announce/2010-09/msg00004.html
https://www.ubuntu.com/usn/USN-1000-1
https://www.vmware.com/security/advisories/VMSA-2011-0003.html
https://secunia.com/advisories/43315
https://www.securityfocus.com/archive/1/516397/100/0/threaded
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.