Snort: Remote execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200703-01 / snort
Release Date	February 23, 2007
Latest Revision	March 02, 2007: 02
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-analyzer/snort	< 2.6.1.3	>= 2.6.1.3	All supported architectures

Related bugreports: #167730

Synopsis

The Snort DCE/RPC preprocessor contains a buffer overflow that could result in the remote execution of arbitrary code.

2. Impact Information

Background

Snort is a widely deployed intrusion detection program.

Description

The Snort DCE/RPC preprocessor does not properly reassemble certain types of fragmented SMB and DCE/RPC packets.

Impact

A remote attacker could send specially crafted fragmented SMB or DCE/RPC packets, without the need to finish the TCP handshake, that would trigger a stack-based buffer overflow while being reassembled. This could lead to the execution of arbitrary code with the permissions of the user running the Snort preprocessor.

3. Resolution Information

Workaround

Disable the DCE/RPC processor by commenting the 'preprocessor dcerpc' section in /etc/snort/snort.conf .

Resolution

All Snort users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-analyzer/snort-2.6.1.3"

4. References

CVE-2006-5276

Updated February 23, 2007

Summary: This is a Gentoo Linux Security Advisory

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