Bug ID 1020337: DNS msg_ObjType can cause buffer overrun due to lack of NUL terminator

Last Modified: Sep 23, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP DNS, GTM, LTM(all modules)

Known Affected Versions:
15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2, 16.1.0

Opened: May 20, 2021
Severity: 3-Major

Symptoms

Tmm cores with umem debug enabled.

Impact

Tmm memory corruption. In some situations, tmm might crash. Traffic disrupted while tmm restarts.

Conditions

A string operation is performed against DNS resource records (RRs) from DNSMSG::section in an iRule.

Workaround

Do not use string operations against DNS RRs returned from DNSMSG::section.

Fix Information

None

Behavior Change