Arch Linux Security Advisory ASA-202101-18 ========================================== Severity: High Date : 2021-01-12 CVE-ID : CVE-2020-35679 CVE-2020-35680 Package : opensmtpd Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-1381 Summary ======= The package opensmtpd before version 6.8.0p2-1 is vulnerable to multiple issues including information disclosure and denial of service. Resolution ========== Upgrade to 6.8.0p2-1. # pacman -Syu "opensmtpd>=6.8.0p2-1" The problems have been fixed upstream in version 6.8.0p2. Workaround ========== None. Description =========== - CVE-2020-35679 (information disclosure) smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might allow attackers to trigger a "very significant" memory leak via messages to an instance that performs many regex lookups. - CVE-2020-35680 (denial of service) smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer. Impact ====== A malicious remote user might read memory or crash the service. References ========== https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c99100... https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0... https://security.archlinux.org/CVE-2020-35679 https://security.archlinux.org/CVE-2020-35680