HTTP: PNG IHDR-chunk Invalid Length
This anomaly triggers if the PNG IHDR-chunk length value is different from 13 bytes, which is the only correct value. Triggering this incident can indicate malicious behavior aimed at your system.
References
URL: http://www.libpng.org/pub/png/spec/iso/index-object.html
Short Name
HTTP:STC:IMG:PNG_IHDR_INVAL_LEN
Severity
Minor
Recommended
False
Recommended Action
None
Category
HTTP
Keywords
IHDR PNG chunk length
Release Date
11/07/2005
Supported Platforms
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
vsrx-19.4
vsrx-12.3
srx-12.3
vsrx-19.2
srx-19.3
Sigpack Version
3708
False Positive
Unknown