Gentoo Linux Security Advisory GLSA 200905-01 - Multiple vulnerabilities have been found in Asterisk allowing for Denial of Service and username disclosure.
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Asterisk Project Security Advisory - An attacker may request an Asterisk server to send part of a firmware image. However, as this firmware download protocol does not initiate a handshake, the source address may be spoofed. Therefore, an IAX2 FWDOWNL request for a firmware file may consume as little as 40 bytes, yet produces a 1040 byte response. Coupled with multiple geographically diverse Asterisk servers, an attacker may flood an victim site with unwanted firmware packets.
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