An integer overflow leading to a heap-based buffer overflow was found in the read_packet() function of the libxcb library, the X protocol C-language Binding (XCB) 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 libxcb tracking bugs for this issue
Affects: fedora-all [bug 966831]
libxcb-1.9-3.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 libxcb as shipped with Red Hat Enterprise Linux 6.
libxcb-1.9-3.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