A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, caused by improper validation of a field (pz_log2_bs) read from ISO9660 Rock Ridge extensions. A remote attacker can exploit this by supplying a specially crafted ISO file. This can lead to incorrect memory allocation and potential application crashes, resulting in a denial-of-service (DoS) condition.
To mitigate this issue, avoid processing untrusted ISO9660 images with libarchive. Restricting the sources of ISO files and ensuring they originate from trusted entities can prevent exploitation.