Info

Disclosure

Apr 12, 2006

Discovery

Unknown

Dates

Exploit

Unknown

Solution

Unknown

Description

The Linux Kernel contains a flaw that may allow a malicious user to bypass IPC permissions. The issue is triggered because a 'madvise_remove' call does not follow file and mmap restrictions. It is possible that the flaw may allow an attacker to bypass IPC permissions and replace portions of readonly TMPFS files with zeroes, resulting in a loss of integrity.

Classification

Location: Local Access Required
Attack Type: Other
Impact: Loss of Integrity
Exploit: Exploit Unknown
Disclosure: OSVDB Verified, Vendor Verified

Solution

Upgrade to version 2.6.16.7 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Linux	Kernel	2.6.16.5
		2.6.16.6
		2.6.16
		2.6.16.1
		2.6.16.2
		2.6.16.3
		2.6.16.4

References

Bugtraq ID: 17587
Secunia Advisory ID: 19657 19664 19735 20398 20671 21954
CVE ID: 2006-1524 (see also: NVD)
SCIP VulDB ID: 2177
Keyword: aka the MADV_REMOVE vulnerability
Vendor Specific News/Changelog Entry: http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.6
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.7
Vendor Specific Advisory URL: http://www.novell.com/linux/security/advisories/2006-05-31.html
http://www.trustix.org/errata/2006/0051/
Other Advisory URL: http://www.us.debian.org/security/2006/dsa-1097

Credit

Hugh Dickins - hughveritas.com -

Direct URL: http://osvdb.org/24714