Arch Linux Security Advisory ASA-201810-8 ========================================= Severity: High Date : 2018-10-09 CVE-ID : CVE-2018-6951 CVE-2018-6952 CVE-2018-1000156 Package : patch Type : multiple issues Remote : No Link : https://security.archlinux.org/AVG-619 Summary ======= The package patch before version 2.7.6-3 is vulnerable to multiple issues including arbitrary command execution and denial of service. Resolution ========== Upgrade to 2.7.6-3. # pacman -Syu "patch>=2.7.6-3" The problems have been fixed upstream but no release is available yet. Workaround ========== None. Description =========== - CVE-2018-6951 (denial of service) An issue was discovered in GNU patch through 2.7.6. There is a segmentation fault, associated with a NULL pointer dereference, leading to a denial of service in the intuit_diff_type function in pch.c, aka a "mangled rename" issue. - CVE-2018-6952 (denial of service) A double free exists in the another_hunk function in pch.c in GNU patch through 2.7.6. An attacker could potentially use this flaw to crash the patch utility by tricking it into processing crafted patches. - CVE-2018-1000156 (arbitrary command execution) An arbitrary command execution vulnerability has been found in patch versions prior to 2.7.7 when applying ed-style patches. Due to insufficient sanitization of the input patch stream, it is possible for a patch file to cause patch to pass certain ed scripts to the ed editor, which would run commands. This issue could be exploited to execute arbitrary commands as the user invoking patch against a specially crafted patch file, which could be leveraged to obtain elevated privileges. Impact ====== An attacker can execute arbitrary commands or crash the patch utility via a specially crafted patch file. References ========== https://bugs.archlinux.org/task/57526 https://savannah.gnu.org/bugs/?53132 https://git.savannah.gnu.org/cgit/patch.git/commit/?id=f290f48a621867084884b... https://savannah.gnu.org/bugs/?53133 https://git.savannah.gnu.org/cgit/patch.git/commit/?id=9c986353e420ead6e7062... https://savannah.gnu.org/bugs/?53566 https://git.savannah.gnu.org/cgit/patch.git/commit/?id=123eaff0d5d1aebe12829... https://security.archlinux.org/CVE-2018-6951 https://security.archlinux.org/CVE-2018-6952 https://security.archlinux.org/CVE-2018-1000156