The wordexp function in GNU C Library (aka glibc) 2.21 does not enforce the WRDE_NOCMD flag, which allows context-dependent attackers to execute arbitrary commands, as demonstrated by input containing "$((
An attacker with local access and knowledge of how to make the glibc function trigger an exploit may be able to run arbitrary code. However, the risk level for this vulnerability is considered LOW because F5 product development has verified that the vulnerable code is NOT used in a way that would make an exploit possible.
If the previous table lists a version in the Versions known to be not vulnerable column, you can eliminate this vulnerability by upgrading to the listed version. If the listed version is older than the version you are currently running, or if the table does not list any version in the column, then no upgrade candidate currently exists.
F5 is responding to this vulnerability as determined by the parameters defined in K4602: Overview of the F5 security vulnerability response policy.
To mitigate this vulnerability, you should permit access to F5 products only over a secure network, and limit login access to trusted users. For additional information, refer to K13092: Overview of securing access to the BIG-IP system.