A security issue has been reported in Gentoo, which can be exploited by malicious people to compromise a vulnerable system.
The security issue is caused due to the MLDonkey ebuild incorrectly adding a new "p2p" user to the system with an empty password and a valid login shell. This can be exploited to gain access to an affected system.
Successful exploitation requires that a remote login server that allows empty passwords is installed on the system.
The security issue is reported in versions prior to 2.9.0-r3.
Solution: The vendor recommends changing the login shell of the "p2p" user to deny login (e.g. "usermod -s /bin/false p2p").
Provided and/or discovered by: The vendor credits Ramin.
Original Advisory: http://www.gentoo.org/security/en/glsa/glsa-200710-25.xml
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