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Date: Fri, 16 Mar 2012 18:50:04 +0100
From: Jan Lieskovsky <>
CC: Michal Schmidt <>
Subject: [Notification] CVE-2012-1174 systemd: TOCTOU race condition by removing
 user session

Hello vendors,

   this is to inform you about the following flaw in systemd:

A TOCTOU race condition was found in the way the systemd-logind login manager
of the systemd, a system and service manager for Linux, performed removal of
particular records related with user session upon user logout. A local attacker
could use this flaw to conduct symbolic link attacks, potentially leading to
removal of arbitrary system file.

Upstream patch:

Red Hat Bugzilla entry:

Credit: Issue reported by Michal Schmidt of Red Hat.

Flaw turnaround time: 16 days

Thank you && Regards, Jan.
Jan iankko Lieskovsky / Red Hat Security Response Team

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