cmd5checkpw: Local password leak vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200502-30 / cmd5checkpw
Release Date	February 25, 2005
Latest Revision	May 22, 2006: 02
Impact	low
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-mail/cmd5checkpw	<= 0.22-r1	>= 0.22-r2	All supported architectures

Related bugreports: #78256

Synopsis

cmd5checkpw contains a flaw allowing local users to access other users cmd5checkpw passwords.

2. Impact Information

Background

cmd5checkpw is a checkpassword compatible authentication program that uses CRAM-MD5 authentication mode.

Description

Florian Westphal discovered that cmd5checkpw is installed setuid cmd5checkpw but does not drop privileges before calling execvp(), so the invoked program retains the cmd5checkpw euid.

Impact

Local users that know at least one valid /etc/poppasswd user/password combination can read the /etc/poppasswd file.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All cmd5checkpw users should upgrade to the latest available version:

Code Listing 3.1: Resolution

# emerge --sync 
# emerge --ask --oneshot --verbose ">=net-mail/cmd5checkpw-0.22-r2"

4. References

CVE-2005-0580

Updated February 25, 2005

Summary: This is a Gentoo Linux Security Advisory

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