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OpenBSD ICMP6 Packet "mbuf" Memory Corruption Vulnerability Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA24490  
Release Date: 2007-03-12
Last Update: 2007-03-16

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Patch

OS:OpenBSD 3.x
OpenBSD 4.0


CVE reference:CVE-2007-1365 (Secunia mirror)

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Description:
A vulnerability has been reported in OpenBSD, which can be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a memory corruption within the "mbuf" handling of ICMP6 packets. This can be exploited to cause a kernel panic or execute arbitrary code with kernel privileges.

Successful exploitation requires that an attacker can send fragmented ICMPv6 packets to a target local system.

The vulnerability is reported in versions 3.1 through 4.0. Other versions may also be affected.

Solution:
Apply patches or filter IPv6 packets as a workaround.

OpenBSD 3.9:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/020_m_dup1.patch

OpenBSD 4.0:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/010_m_dup1.patch

Provided and/or discovered by:
Alfredo Ortega, Core Security Technologies

Changelog:
2007-03-14: Updated advisory with new information from Core Security. Increased criticality.
2007-03-14: Added CVE reference.
2007-03-16: Added link to US-CERT.

Original Advisory:
OpenBSD:
http://www.openbsd.org/errata40.html#m_dup1

Core Security:
http://www.coresecurity.com/index.php...ontentMod&action=item&id=1703

Other References:
US-CERT VU#986425:
http://www.kb.cert.org/vuls/id/986425



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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