Arch Linux Security Advisory ASA-202204-3 ========================================= Severity: High Date : 2022-04-04 CVE-ID : CVE-2018-25032 Package : zlib Type : arbitrary code execution Remote : Yes Link : https://security.archlinux.org/AVG-2657 Summary ======= The package zlib before version 1:1.2.12-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 1:1.2.12-1. # pacman -Syu "zlib>=1:1.2.12-1" The problem has been fixed upstream in version 1.2.12. Workaround ========== None. Description =========== An out-of-bounds access flaw was found in zlib before 1.2.12, which allows memory corruption when deflating (ex: when compressing) if the input has many distant matches. For some rare inputs with a large number of distant matches (crafted payloads), the buffer into which the compressed or deflated data is written can overwrite the distance symbol table which it overlays. This issue results in corrupted output due to invalid distances, which leads to out-of-bound access, corrupting the memory and crashing the application or potentially execute arbitrary code. Impact ====== A remote attacker is able to use a specially crafted input to crash an application that is using zlib or potentially execute arbitrary code on the affected host. References ========== https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c5... https://github.com/madler/zlib/issues/605 https://www.openwall.com/lists/oss-security/2022/03/24/1 https://www.openwall.com/lists/oss-security/2022/03/26/1 https://security.archlinux.org/CVE-2018-25032