Red Hat Security Advisory 2013-1319-01 - SSSD provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides NSS and PAM interfaces toward the system and a pluggable back end system to connect to multiple different account sources. A race condition was found in the way SSSD copied and removed user home directories. A local attacker who is able to write into the home directory of a different user who is being removed could use this flaw to perform symbolic link attacks, possibly allowing them to modify and delete arbitrary files with the privileges of the root user.
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