From: Secunia Security Advisories (sec-advsecunia.com)
Date: Fri Dec 24 2004 - 09:21:50 CST

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TITLE:
Linux Kernel 32bit System Call Emulation and ELF Binary
Vulnerabilities

SECUNIA ADVISORY ID:
SA13627

VERIFY ADVISORY:
http://secunia.com/advisories/13627/

CRITICAL:
Less critical

IMPACT:
Privilege escalation, DoS

WHERE:
Local system

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

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

1) A boundary error exists in the system call handling in the 32bit
system call emulation on AMD64 / Intel EM64T systems.

2) An unspecified error within the memory management handling of ELF
executables in "load_elf_binary" can be exploited to crash the system
via a specially crafted ELF binary.

Issue 2 only affects Kernel versions prior to 2.4.26.

SOLUTION:
Issue 2 has been fixed in Kernel version 2.4.26 and later.

Secunia is currently not aware of an official updated version which
fixes issue 1. However, updated packages have been issued by some
Linux vendors.

Do not grant access to untrusted users.

PROVIDED AND/OR DISCOVERED BY:
1) Petr Vandrovec
2) Kirill Korotaev

ORIGINAL ADVISORY:
http://rhn.redhat.com/errata/RHSA-2004-689.html

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