SynopsisThe remote mail server is prone to a buffer overflow attack.
DescriptionThe remote server is running Citadel, an open source solution for email and collaboration.
According to its version, the installation of Citadel on the remote host uses insufficient bounds-checking in its SMTP service during memory-copy operations when processing input to the RCPT TO command.
An unauthenticated, remote attacker may be able to leverage this issue to cause a stack-based buffer overflow, resulting in a crash of the affected service or even execution of arbitrary code.
SolutionUpgrade to Citadel version 7.11 or later.