Signature Detail
Short Name |
SYSLOG:FAILURES:UNEXP-REPLY |
|---|---|
Severity |
High |
Recommended |
No |
Category |
SYSLOG |
Release Date |
2003/08/27 |
Update Number |
1213 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
SYSLOG: Unexpected Reply
This protocol anomaly triggers when it detects a SYSLOG server reply. The SYSLOG protocol is a one-way protocol (client to the server) and the server should not send replies. This can indicate tunneling over the SYSLOG protocol.
Extended Description
The presence of this packet could indicate a software misconfiguration or that a remote attacker is attempting to tunnel over UDP port 514 to bypass firewall rules.
References