It was discovered that libtasn1 library function asn1_get_bit_der() could incorrectly report negative bit length of the value read from ASN.1 input. This could possibly lead to an out of bounds access in an application using libtasn1, for example in case if application tried to terminate read value with NUL byte. The following upstream commit corrects the issue and causes the function to report error rather than return negative length value: http://git.savannah.gnu.org/cgit/libtasn1.git/commit/?id=1c3ccb3e040bf13e342ee60bc23b21b97b11923f
Acknowledgment: Red Hat would like to thank GnuTLS upstream for reporting this issue.
Fixed upstream in libtasn1 3.6: http://lists.gnu.org/archive/html/help-libtasn1/2014-05/msg00006.html
Created libtasn1 tracking bugs for this issue: Affects: fedora-all [bug 1103087]
Created mingw-libtasn1 tracking bugs for this issue: Affects: fedora-all [bug 1103088]
Created mingw32-gnutls tracking bugs for this issue: Affects: epel-5 [bug 1103089]
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2014:0596 https://rhn.redhat.com/errata/RHSA-2014-0596.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2014:0594 https://rhn.redhat.com/errata/RHSA-2014-0594.html
libtasn1-3.6-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
libtasn1-3.6-1.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 has been addressed in following products: Red Hat Enterprise Linux 7 Via RHSA-2014:0687 https://rhn.redhat.com/errata/RHSA-2014-0687.html
This issue has been addressed in following products: RHEV-H and Agents for RHEL-6 Via RHSA-2014:0815 https://rhn.redhat.com/errata/RHSA-2014-0815.html