Bug ID 499347: JSON UTF16 content could be blocked by ASM as Malformed JSON

Last Modified: Oct 01, 2018

Bug Tracker

Affected Product:  See more info
BIG-IP ASM(all modules)

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1

Fixed In:
12.0.0, 11.6.1 HF2, 11.5.4 HF3

Opened: Jan 05, 2015
Severity: 2-Critical

Symptoms

When JSON UTF16 content is handled by ASM and the content includes one of the characters below, the request could be blocked by ASM policy. XML_CHAR_BACKSLASH XML_CHAR_LEFT_CURLY_BRACKET XML_CHAR_RIGHT_CURLY_BRACKET

Impact

False positive request blocking.

Conditions

ASM policy assigned to a virtual server and the policy configured to enforce JSON content.

Workaround

None.

Fix Information

JSON unicode_charmap table has been fixed, thus UTF16 characters are interpreted correctly.

Behavior Change