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TITLE:
Linux Kernel "sendmsg()" and "raw_sendmsg()" Vulnerabilities

SECUNIA ADVISORY ID:
SA16747

VERIFY ADVISORY:
http://secunia.com/advisories/16747/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, Privilege escalation, DoS

WHERE:
Local system

REVISION:
1.1 originally posted 2005-09-09

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/
Linux Kernel 2.4.x
http://secunia.com/product/763/

DESCRIPTION:
Alexander Viro has reported two vulnerabilities in the Linux kernel,
which potentially can be exploited by malicious, local users to
disclose certain sensitive information, cause a DoS (Denial of
Service) or gain escalated privileges.

1) A boundary error in "sendmsg()" when copying 32bit "msg_control"
contents from user-space to the kernel can be exploited to cause a
buffer overflow. This may allow a malicious user to gain root
privileges and execute arbitrary code with kernel privileges.

2) An error in the "raw_sendmsg()" function may allow a malicious
user to read kernel memory contents and disclose certain information,
or to manipulate certain hardware state to cause a DoS.

The vulnerabilities have been reported in version 2.4.21 and 2.6.9.
Other versions may also be affected.

SOLUTION:
Secunia is currently not aware of an official patch or updated
version fixing this vulnerability.

Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Alexander Viro

CHANGELOG:
2005-09-09: Added information about additional vulnerability.

ORIGINAL ADVISORY:
Red Hat:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=166248
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=166249
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=166830

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About:
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