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.

Short Name
TCP:OPTERR:SYN-SACK
Severity
Minor
Recommended
False
Recommended Action
None
Category
TCP
Release Date
04/22/2003
Supported Platforms

srx-branch-12.3

srx-19.3

srx-branch-19.3

vsrx3bsd-19.2

srx-branch-19.4

vsrx-19.4

mx-12.3

mx-19.4

vmx-19.4

mx-19.3

vsrx3bsd-19.4

srx-19.4

vsrx-12.3

vmx-19.3

vsrx-19.2

srx-12.3

Sigpack Version
3324
False Positive
Unknown

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