Ubuntu has issued an update for shadow. This fixes a vulnerability, which can be exploited by malicious, local users to manipulate certain data.
The vulnerability is caused due to an input validation error in the "chfn" and "chsh" utilities, which does not properly handle newlines characters when updating the GECOS fields. This can be exploited to add arbitrary content to the /etc/passwd file and e.g. create NIS users or groups.
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Subject: Ubuntu update for shadow
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