Asterisk: Multiple vulnerabilities Multiple vulnerabilities have been found in Asterisk allowing for Denial of Service and username disclosure. asterisk 2009-05-02 2009-05-02 218966 224835 232696 232698 237476 250748 254304 remote 1.2.32 1.2.32

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).

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" CVE-2008-1897 CVE-2008-2119 CVE-2008-3263 CVE-2008-3264 CVE-2008-3903 CVE-2008-5558 CVE-2009-0041 rbu rbu rbu