IBM Information for VU#368819

Double Free Bug in zlib Compression Library Corrupts malloc's Internal Data Structures



Vendor Statement

IBM's AIX operating system, version 5.1, ships with open source-originated zlib that is used with the Red Hat Package Manager (rpm) to install applications that are included in the AIX-Linux Affinity Toolkit. zlib (libz.a) is a shared library in AIX. AIX 5.1 is presumed susceptible to the described vulnerability, though we have not demonstrated exploitability yet. AIX 4.3.x does not ship with zlib, but customers who install zlib and use it may be similarly vulnerable.

The updated zlib package can be downloaded by directing your browser to:

The updated rpm package can be downloaded from: