l2tpd: Buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200407-17 / net-dialup/l2tpd
Release Date	July 22, 2004
Latest Revision	July 22, 2004: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-dialup/l2tpd	< 0.69-r2	>= 0.69-r2	All supported architectures

Related bugreports: #53009

Synopsis

A buffer overflow in l2tpd could lead to remote code execution. It is not known whether this bug is exploitable.

2. Impact Information

Background

l2tpd is a GPL implentation of the Layer 2 Tunneling Protocol.

Description

Thomas Walpuski discovered a buffer overflow that may be exploitable by sending a specially crafted packet. In order to exploit the vulnerable code, an attacker would need to fake the establishment of an L2TP tunnel.

Impact

A remote attacker may be able to execute arbitrary code with the privileges of the user running l2tpd.

3. Resolution Information

Workaround

There is no known workaround for this vulnerability.

Resolution

All users are recommended to upgrade to the latest stable version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=net-l2tpd-0.69-r2"
# emerge ">=net-l2tpd-0.69-r2"

4. References

Page updated July 22, 2004

Summary: This is a Gentoo Linux Security Advisory

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