Vulnerability identifier: #VU44034

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-3363

CWE-ID: CWE-20

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 perform a denial of service (DoS) attack.

The setup_cifs_sb function in fs/cifs/connect.c in the Linux kernel before 2.6.39 does not properly handle DFS referrals, which allows remote CIFS servers to cause a denial of service (system crash) by placing a referral at the root of a share.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 2.6.0 - 2.6.38.8

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External links
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=70945643722ffeac779d2529a348f99567fa5c33
http://www.openwall.com/lists/oss-security/2011/09/14/12
http://bugzilla.redhat.com/show_bug.cgi?id=738291
http://github.com/torvalds/linux/commit/70945643722ffeac779d2529a348f99567fa5c33

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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.