It only happens with certain stock spam, but a small prcentage of even look alike spam. The spam option on the firewall should move the spam to a different folder, but it doesn't work on imap folder where I make the transfer. Besides, I have disabled it as it's totally useless.. I move the spam in bulk between imap folders, when it finds the spam in question it gives a firewall warning;
"Details: Attempted Intrusion "IMAP Mailbox Name Length BO" from your machine against imap.spamcop.net(216.154.195.50) was detected and blocked.
Intruder: OWNER-Mehere(67.186.61.132)(3143).
Risk Level: Medium.
Protocol: TCP.
Attacked IP: imap.spamcop.net(216.154.195.50).
Attacked Port: imap(143)."
Their explanation:
QUOTE
IMAP Mailbox Name Length BO
Severity: Medium
This attack could pose a moderate security threat. It does not require immediate action.
Description
This signature detects attempts to exploit a buffer overflow vulnerability due to the unchecked mailbox name length in some IMAP commands.
it seems to be bogus or a false positive, but certaily triggered by unusual spam.
The glitch is independent of the PC or operating system, I get the same error on different PCs with different OS and connections (work vs. home)