Two denial of service flaws were found in Asterisk. From http://downloads.asterisk.org/pub/security/AST-2013-004.html
"A remotely exploitable crash vulnerability exists in the SIP channel driver if an ACK with SDP is received after the channel has been terminated. The handling code incorrectly assumes that the channel will always be present."
This issue affected versions 1.8.x (22.214.171.124 and above) and all 11.x versions.
"A remotely exploitable crash vulnerability exists in the SIP channel driver if an invalid SDP is sent in a SIP request that defines media descriptions before connection information. The handling code incorrectly attempts to reference the socket address information even though that information has not yet been set."
This issue affected all versions of 1.8.x, 10.x, and 11.x.
A remote attacker could use these flaws to crash Asterisk. Patches are linked to from the below advisories. These issues affect the versions of Asterisk in Fedora and EPEL 6.
Created asterisk tracking bugs for this issue:
Affects: fedora-all [bug 1002045]
Affects: epel-6 [bug 1002046]
AST-2013-004 was assigned CVE-2013-5641
AST-2013-005 was assigned CVE-2013-5642
asterisk-11.5.1-2.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
asterisk-11.5.1-2.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.