Arch Linux Security Advisory ASA-201412-24 ========================================== Severity: Critical Date : 2014-12-22 CVE-ID : CVE-2014-9293 CVE-2014-9294 CVE-2014-9295 CVE-2014-9296 Package : ntp Type : multiple issues Remote : Yes Link : https://wiki.archlinux.org/index.php/CVE-2014 Summary ======= The package ntp before version 4.2.8-1 is vulnerable to multiple issues including but not limited to arbitrary code execution, denial of service and weak key generation. Resolution ========== Upgrade to 4.2.8-1. # pacman -Syu "ntp>=4.2.8-1" The problems have been fixed upstream in version 4.2.8. Workaround ========== None. Description =========== Keys explicitly generated by "ntp-keygen -M" should be regenerated. - CVE-2014-9293 (weak key generation) ntpd generated a weak key for its internal use, with full administrative privileges. Attackers could use this key to reconfigure ntpd (or to exploit other vulnerabilities). - CVE-2014-9294 (weak key generation) The ntp-keygen utility generated weak MD5 keys with insufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via a brute-force attack. - CVE-2014-9295 (arbitrary code execution) Multiple stack-based buffer overflows in allow remote attackers to execute arbitrary code via a crafted packet, related to (1) the crypto_recv function when the Autokey Authentication feature is used, (2) the ctl_putdata function, and (3) the configure function. - CVE-2014-9296 (unintended association change) The receive function in ntp_proto.c continues to execute after detecting a certain authentication error, which might allow remote attackers to trigger an unintended association change via crafted packets. Impact ====== A remote attacker is able to craft packets leading to arbitrary code execution, denial of service or make use of a weak key generation flaw to perform cryptographic attacks against the authentication. References ========== https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9293 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9294 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9295 https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-9296 https://bugs.ntp.org/show_bug.cgi?id=2665 https://bugs.ntp.org/show_bug.cgi?id=2666 https://bugs.ntp.org/show_bug.cgi?id=2667 https://bugs.ntp.org/show_bug.cgi?id=2670