#VU44031 Buffer overflow in Linux kernel - CVE-2011-3191

Vulnerability identifier: #VU44031

Vulnerability risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2011-3191

CWE-ID: CWE-119

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Linux Foundation

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1 allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large length value in a response to a read request for a directory.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.0.101

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External links
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9438fabb73eb48055b58b89fc51e0bc4db22fabd
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
https://www.openwall.com/lists/oss-security/2011/08/24/2
https://bugzilla.redhat.com/show_bug.cgi?id=732869
https://github.com/torvalds/linux/commit/9438fabb73eb48055b58b89fc51e0bc4db22fabd

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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