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Multiple vulnerabilities have been found in Asterisk allowing for Denial of Service and username disclosure.
Asterisk is an open source telephony engine and toolkit.
Multiple vulnerabilities have been discovered in the IAX2 channel driver when performing the 3-way handshake (CVE-2008-1897), when handling a large number of POKE requests (CVE-2008-3263), when handling authentication attempts (CVE-2008-5558) and when handling firmware download (FWDOWNL) requests (CVE-2008-3264). Asterisk does also not correctly handle SIP INVITE messages that lack a "From" header (CVE-2008-2119), and responds differently to a failed login attempt depending on whether the user account exists (CVE-2008-3903, CVE-2009-0041). Impact
Remote unauthenticated attackers could send specially crafted data to Asterisk, possibly resulting in a Denial of Service via a daemon crash, call-number exhaustion, CPU or traffic consumption. Remote unauthenticated attackers could furthermore enumerate valid usernames to facilitate brute force login attempts.
There is no known workaround at this time.
All Asterisk users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.32"
[ 1 ] CVE-2008-1897
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1897 [ 2 ] CVE-2008-2119
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2119 [ 3 ] CVE-2008-3263
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3263 [ 4 ] CVE-2008-3264
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3264 [ 5 ] CVE-2008-3903
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3903 [ 6 ] CVE-2008-5558
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5558 [ 7 ] CVE-2009-0041
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