Symptoms

When a session variable set by AD/LDAP module is HEX-encoded, it is possible to decode it with the -decode option for the mcget command. The option works correctly when the session variable contains multiple values (such as | 0xABCD | 0xDCBA |), but it does not work properly with a single encoded value (such as0xABCD).

Impact

As a result, the access policy does not follow the expected branch rule.

Conditions

The problem occurs under these conditions: the -decode option is specified when retrieving a HEX-encoded variable, and the session variable contains only one value/

Workaround

While decoding a single value, the mcget command produces a result like EncodedValueDecodedValue. For example, for encoded string 0x616161, the result of the operation will be 616161aaa. It is possible to write a Tcl expression in the Variable Assign agent that truncates the left half of the string and leaves aaa, the decoded value only.

Fix Information

The -decode option works as expected for single-value and multi-value session variables.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips