Arch Linux Security Advisory ASA-202007-6 ========================================= Severity: High Date : 2020-07-31 CVE-ID : CVE-2020-10759 Package : libjcat Type : insufficient validation Remote : Yes Link : https://security.archlinux.org/AVG-1185 Summary ======= The package libjcat before version 0.1.3-1 is vulnerable to insufficient validation. Resolution ========== Upgrade to 0.1.3-1. # pacman -Syu "libjcat>=0.1.3-1" The problem has been fixed upstream in version 0.1.3. Workaround ========== None. Description =========== A PGP signature verification bypass has been found in fwupd prior to 1.4.0, and in libjcat <= 0.1.2. The issue is that if a detached signature is actually a PGP message, gpgme_op_verify() returns the rather perplexing GPG_ERR_NO_ERROR, and then gpgme_op_verify_result() builds an empty list. Impact ====== A local attacker could pass signature validation with a crafted message. References ========== https://github.com/justinsteven/advisories/blob/master/2020_fwupd_dangling_s... https://github.com/hughsie/libjcat/commit/839b89f https://security.archlinux.org/CVE-2020-10759