A vulnerability has been identified in Fetchmail, which could be exploited by attackers to cause a denial of service. This issue is caused by a NULL pointer dereference in the "send_bouncemail()" [sink.c] function when warning messages are refused by the SMTP listener, which could be exploited by attackers to cause a denial of service by tricking a user into connecting to a malicious SMTP server.
Credits
Vulnerability reported by Earl Chew.
ChangeLog
2007-09-03 : Initial release
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