Signature Detail
Short Name |
TCP:OPTERR:SYN-SACK |
|---|---|
Severity |
Medium |
Recommended |
No |
Category |
TCP |
Release Date |
2003/04/22 |
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+ |
TCP: Options Error SACK in SYN Packet
This protocol anomaly triggers when it detects a SACK specification in a SYN packet. SYN packets should carry only SACKPERM, not SACK itself. It is recommended to drop these packets.
Extended Description
If any TCP/IP datagram contains both a SACK value and the SYN flag, then this constitutes a protocol anomaly. Detection of this condition could indicate a network configuration error. It could also indicate that malicious activity involving injection of malformed IP packets is underway.
References