pinentry: Local privilege escalation

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200601-01 / pinentry
Release Date	January 03, 2006
Latest Revision	January 03, 2006: 01
Impact	normal
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-crypt/pinentry	< 0.7.2-r2	>= 0.7.2-r2	All supported architectures

Related bugreports: #116822

Synopsis

pinentry is vulnerable to privilege escalation.

2. Impact Information

Background

pinentry is a collection of simple PIN or passphrase entry dialogs which utilize the Assuan protocol.

Description

Tavis Ormandy of the Gentoo Linux Security Audit Team has discovered that the pinentry ebuild incorrectly sets the permissions of the pinentry binaries upon installation, so that the sgid bit is set making them execute with the privileges of group ID 0.

Impact

A user of pinentry could potentially read and overwrite files with a group ID of 0.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All pinentry users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/pinentry-0.7.2-r2"

4. References

CVE-2006-0071

Page updated January 03, 2006

Summary: This is a Gentoo Linux Security Advisory

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