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[ GLSA 200710-25 ] MLDonkey: Privilege escalation
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GLSA
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PostPosted: Wed Oct 24, 2007 10:26 pm    Post subject: [ GLSA 200710-25 ] MLDonkey: Privilege escalation Reply with quote

Gentoo Linux Security Advisory

Title: MLDonkey: Privilege escalation (GLSA 200710-25)
Severity: high
Exploitable: remote
Date: October 24, 2007
Updated: November 07, 2007
Bug(s): #189412
ID: 200710-25

Synopsis

The Gentoo MLDonkey ebuild adds a user to the system with a valid login shell and no password.

Background

MLDonkey is a peer-to-peer filesharing client that connects to several different peer-to-peer networks, including Overnet and BitTorrent.

Affected Packages

Package: net-p2p/mldonkey
Vulnerable: < 2.9.0-r3
Unaffected: >= 2.9.0-r3
Architectures: All supported architectures


Description

The Gentoo MLDonkey ebuild adds a user to the system named "p2p" so that the MLDonkey service can run under a user with low privileges. With older Portage versions this user is created with a valid login shell and no password.

Impact

A remote attacker could log into a vulnerable system as the p2p user. This would require an installed login service that permitted empty passwords, such as SSH configured with the "PermitEmptyPasswords yes" option, a local login console, or a telnet server.

Workaround

See Resolution.

Resolution

Change the p2p user's shell to disallow login. For example, as root run the following command:
Code:
# usermod -s /bin/false p2p
NOTE: updating to the current MLDonkey ebuild will not remove this vulnerability, it must be fixed manually. The updated ebuild is to prevent this problem from occurring in the future.

References

CVE-2007-5714


Last edited by GLSA on Thu Nov 08, 2007 4:18 am; edited 1 time in total
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