Linux Kernel 3.3-3.8 sock_diag out-of-bounds

2013.02.24

Credit: Mathias

Risk: Medium

Local: No

Remote: Yes

CVE: CVE-2013-1763

CWE: CWE-20

CVSS Base Score: 7.2/10

Impact Subscore: 10/10

Exploitability Subscore: 3.9/10

Exploit range: Local

Attack complexity: Low

Authentication: No required

Confidentiality impact: Complete

Integrity impact: Complete

Availability impact: Complete

An unprivileged user can send a netlink message resulting in an
out-of-bounds access of the sock_diag_handlers[] array which, in turn,
allows userland to take over control while in kernel mode.

Patch (already in net/master):
http://thread.gmane.org/gmane.linux.network/260061

Affected versions:
v3.3 - v3.8

PoC is not attached this time but can be requested on demand. Hint:
Works well on Fedora 18, bypassing all mmap_min_addr checks. ;)


Thanks,
Mathias

References:

http://thread.gmane.org/gmane.linux.network/260061

See this note in RAW Version

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Linux Kernel 3.3-3.8 sock_diag out-of-bounds

References:

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