Arch Linux Security Advisory ASA-201707-20 ========================================== Severity: Medium Date : 2017-07-18 CVE-ID : CVE-2017-7186 CVE-2017-7244 CVE-2017-7245 CVE-2017-7246 Package : pcre Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-222 Summary ======= The package pcre before version 8.41-1 is vulnerable to multiple issues including denial of service and arbitrary code execution. Resolution ========== Upgrade to 8.41-1. # pacman -Syu "pcre>=8.41-1" The problems have been fixed upstream in version 8.41. Workaround ========== None. Description =========== - CVE-2017-7186 (denial of service) libpcre1 in PCRE 8.40 and libpcre2 in PCRE2 10.23 allow remote attackers to cause a denial of service (segmentation violation for read access, and application crash) by triggering an invalid Unicode property lookup. - CVE-2017-7244 (denial of service) A stack-based read buffer overflow has been found in libpcre <= 8.40, in the pcretest utility. It can lead to denial of service via a crafted expression passed to the pcretest command. - CVE-2017-7245 (arbitrary code execution) A stack-based write buffer overflow has been found in libpcre <= 8.40, in the pcretest utility. It can lead to arbitrary code execution via a crafted expression passed to the pcretest command. - CVE-2017-7246 (arbitrary code execution) A stack-based write buffer overflow has been found in libpcre <= 8.40, in the pcretest utility. It can lead to arbitrary code execution via a crafted expression passed to the pcretest command. Impact ====== An attacker can execute arbitrary code on the affected host by tricking a user into passing a crafted expression to the pcretest command. A remote attacker can cause a denial of service against an application using libpcre via a crafted expression. References ========== https://vcs.pcre.org/pcre/code/trunk/pcre_ucd.c?r1=1490&r2=1688&sortby=date https://blogs.gentoo.org/ago/2017/03/20/libpcre-two-stack-based-buffer-overf... https://blogs.gentoo.org/ago/2017/03/20/libpcre-invalid-memory-read-in-_pcre... https://bugs.exim.org/show_bug.cgi?id=2052 https://blogs.gentoo.org/ago/2017/03/14/libpcre-invalid-memory-read-in-match... https://vcs.pcre.org/pcre2/code/trunk/src/pcre2_internal.h?r1=600&r2=670&sortby=date https://vcs.pcre.org/pcre2/code/trunk/src/pcre2_ucd.c?r1=316&r2=670&sortby=date https://security.archlinux.org/CVE-2017-7186 https://security.archlinux.org/CVE-2017-7244 https://security.archlinux.org/CVE-2017-7245 https://security.archlinux.org/CVE-2017-7246