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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Asterisk: Multiple vulnerabilities
Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200610-15
(Asterisk: Multiple vulnerabilities)
Asterisk contains buffer overflows in channels/chan_mgcp.c from the
MGCP driver and in channels/chan_skinny.c from the Skinny channel
driver for Cisco SCCP phones. It also dangerously handles
client-controlled variables to acertain filenames in the Record()
function. Finally, the SIP channel driver in channels/chan_sip.c could
use more resources than necessary under unspecified circumstances.
A remote attacker could execute arbitrary code by sending a crafted
audit endpoint (AUEP) response, by sending an overly large Skinny
packet even before authentication, or by making use of format strings
specifiers through the client-controlled variables. A possible hacker could
also cause a Denial of Service by resource consumption through the SIP
There is no known workaround for the format strings vulnerability at
this time. You can comment the lines in /etc/asterisk/mgcp.conf,
/etc/asterisk/skinny.conf and /etc/asterisk/sip.conf to deactivate the
three vulnerable channel drivers. Please note that the MGCP channel
driver is disabled by default.
All Asterisk users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.13"
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2006 Michel Arboi
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