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Gentoo Linux Security Advisory GLSA 200710-25 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: MLDonkey: Privilege escalation |
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Date: October 24, 2007 |
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Bugs: #189412 |
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ID: 200710-25 |
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Synopsis |
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======== |
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|
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The Gentoo MLDonkey ebuild adds a user to the system with a valid login |
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shell and no password. |
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Background |
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========== |
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|
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MLDonkey is a peer-to-peer filesharing client that connects to several |
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different peer-to-peer networks, including Overnet and BitTorrent. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-p2p/mldonkey < 2.9.0-r3 >= 2.9.0-r3 |
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Description |
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=========== |
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|
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The Gentoo MLDonkey ebuild adds a user to the system named "p2p" so |
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that the MLDonkey service can run under a user with low privileges. |
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This user is created with a valid login shell and no password. |
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Impact |
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====== |
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A remote attacker could log into a vulnerable system as the p2p user. |
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This would require an installed login service that permitted empty |
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passwords, such as SSH configured with the "PermitEmptyPasswords yes" |
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option, a local login console, or a telnet server. |
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Workaround |
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========== |
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See Resolution. |
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Resolution |
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========== |
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Change the p2p user's shell to disallow login. For example, as root run |
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the following command: |
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# usermod -s /bin/false p2p |
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NOTE: updating to the current MLDonkey ebuild will not remove this |
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vulnerability, it must be fixed manually. The updated ebuild is to |
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prevent this problem from occurring in the future. |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200710-25.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2007 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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http://creativecommons.org/licenses/by-sa/2.5 |
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