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Cisco Bug: CSCvu43448 - Firepower IMAP Preprocessor False Positives

Last Modified

Jun 07, 2020

Products (1)

  • Cisco Firepower Management Center

Known Affected Releases

2.9.14.5

Description (partial)

Symptom:
After enabling IMAP preprocessor and intrusion rules IMAP_UNKNOWN_CMD (141:1:2) and IMAP_UNKNOWN_RESP (141:2:2), false positive alerts are seen when pulling emails from IMAP mail server using unencrypted IMAP traffic: 'ID' and 'Enable' are not listed as known commands, which will trigger a lot of false positives when trying to inspect regular use of IMAP traffic.

Conditions:
IMAP Preprocessor is enabled in the Network Analysis Policy and rules 141:1:2 and 141:2:2 configured to generate alerts.
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