#VU42783 Permissions, Privileges, and Access Controls in Linux kernel - CVE-2011-1585

Vulnerability identifier: #VU42783

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-1585

CWE-ID: CWE-264

Exploitation vector: 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 read and manipulate data.

The cifs_find_smb_ses function in fs/cifs/connect.c in the Linux kernel before 2.6.36 does not properly determine the associations between users and sessions, which allows local users to bypass CIFS share authentication by leveraging a mount of a share by a different user.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 2.6.0 - 2.6.35.13

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External links
https://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.36
https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4ff67b720c02c36e54d55b88c2931879b7db1cd2
https://lists.opensuse.org/opensuse-security-announce/2015-04/msg00020.html
https://www.openwall.com/lists/oss-security/2011/04/15/8
https://bugzilla.redhat.com/show_bug.cgi?id=697394
https://github.com/torvalds/linux/commit/4ff67b720c02c36e54d55b88c2931879b7db1cd2

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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 Internet.

Is there known malware, which exploits this vulnerability?

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