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Secunia Security Advisory 28835

Secunia Security Advisory 28835
Posted Feb 11, 2008
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service), disclose potentially sensitive information, and gain escalated privileges.

tags | advisory, denial of service, kernel, local, vulnerability
systems | linux
SHA-256 | 849495a4bb64b356dd0ae811fa3a7855029953c50b9c3e6fc9dc6c020e8f3649

Secunia Security Advisory 28835

Change Mirror Download

----------------------------------------------------------------------

A new version (0.9.0.0 - Release Candidate 1) of the free Secunia PSI
has been released. The new version includes many new and advanced
features, which makes it even easier to stay patched.

Download and test it today:
https://psi.secunia.com/

Read more about this new version:
https://psi.secunia.com/?page=changelog

----------------------------------------------------------------------

TITLE:
Linux Kernel "vmsplice()" System Call Vulnerabilities

SECUNIA ADVISORY ID:
SA28835

VERIFY ADVISORY:
http://secunia.com/advisories/28835/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, Privilege escalation, DoS

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Some vulnerabilities have been reported in the Linux Kernel, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service), disclose potentially sensitive information, and gain
escalated privileges.

The vulnerabilities are caused due to the missing verification of
parameters within the "vmsplice_to_user()",
"copy_from_user_mmap_sem()", and "get_iovec_page_array()" functions
in fs/splice.c before using them to perform certain memory
operations. This can be exploited to e.g. read or write to arbitrary
kernel memory via a specially crafted "vmsplice()" system call.

Successful exploitation allows attackers to e.g. gain "root"
privileges.

Note: The affected system call first appeared in version 2.6.17.

SOLUTION:
Update to version 2.6.23.16 or 2.6.24.2.

PROVIDED AND/OR DISCOVERED BY:
Wojciech Purczynskiof iSEC Security Research and qaaz

ORIGINAL ADVISORY:
iSEC Security Research:
http://www.isec.pl/vulnerabilities/isec-0026-vmsplice_to_kernel.txt

qaaz:
http://milw0rm.com/exploits/5092
http://milw0rm.com/exploits/5093

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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