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.
Credits
Vulnerabilities reported by Barrie Dempster (NGS Software) and the vendor.
ChangeLog
2007-04-25 : Initial release
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