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l2tpd: Buffer overflow


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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.


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

3.  Resolution Information


There is no known workaround for this vulnerability.


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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