An integer overflow leading to a heap-based buffer overflow was found in the XFixesGetCursorImage() function of the libXfixes library, an X.Org X11 libXext runtime library. When a X client is connected to a malicious X server, (modified to return invalid values), it can cause arbirary code execution with the privileges of the user running the X client.
Created attachment 743931 [details]
Created attachment 743932 [details]
Patch for issue:
This issue affects the versions of the libXfixes package, as shipped with Fedora release of 17 and 18. Please schedule an update.
Created libXfixes tracking bugs for this issue
Affects: fedora-all [bug 966694]
libXfixes-5.0-6.20130524gitc480fe327.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.
This issue affects the version of libXfixes as shipped with Red Hat Enterprise Linux 5 and 6.
This issue affects the libXfixes package in Red Hat Enterprise Linux 5. Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not planned to be fixed in Red Hat Enterprise Linux 5 as it is now in Production 3 Phase of the support and maintenance life cycle: https://access.redhat.com/support/policy/updates/errata/
libXfixes-5.0-6.20130524gitc480fe327.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 6
Via RHSA-2014:1436 https://rhn.redhat.com/errata/RHSA-2014-1436.html