>> Asterisk Packets Handling Remote Buffer Overflow and Denial of Service Vulnerabilities
Title : Asterisk Packets Handling Remote Buffer Overflow and Denial of Service Vulnerabilities VUPEN ID : VUPEN/ADV-2007-1534 CVE ID : CVE-2007-2293 - CVE-2007-2294
Rated as : High Risk
Remotely Exploitable : Yes Locally Exploitable : Yes Release Date : 2007-04-25
Technical Description
Multiple vulnerabilities have been identified in Asterisk, which could be exploited by remote attackers to cause a denial of service or take complete control of an affected system.
The first issue is caused by buffer overflow errors in the "process_sdp" [chan_sip.c] function that does not validate the "T38FaxRateManagement" and "T38FaxUdpEC" SDP parameters before being copied into insufficiently sized buffers, which could be exploited by remote unauthenticated attackers to execute arbitrary code by sending a specially crafted packet to an application with T.38 support enabled (disabled by default).
The second vulnerability is caused by a NULL pointer dereference error in the Manager Interface when authenticating a user configured in "manager.conf" without a password, which could be exploited by attackers to crash an affected application, creating a denial of service condition.
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