Thanks for reporting this bug/CVE. It has been added to the Ubuntu CVE tracker and a package update will be prepared for it. Since the CVE is public, I'm marking the bug public as well.
** Information type changed from Private Security to Public Security -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to c-ares in Ubuntu. https://bugs.launchpad.net/bugs/1629085 Title: CVE-2016-5180: out-of-bounds write in ares_create_query and ares_mkquery Status in c-ares package in Ubuntu: New Status in c-ares package in Debian: Fix Released Bug description: A new upstream version of c-ares has been released which addresses a security vulnerability. From: Daniel Stenberg <[email protected]> Date: Thu, 29 Sep 2016 16:02:10 +0200 (CEST) `ares_create_query` single byte out of buffer write ================================================= Project c-ares Security Advisory, September 29, 2016 - [Permalink](https://c-ares.haxx.se/adv_20160929.html) VULNERABILITY ------------- When a string is passed in to `ares_create_query` or `ares_mkquery` and uses an escaped trailing dot, like "hello\.", c-ares calculates the string length wrong and subsequently writes outside of the the allocated buffer with one byte. The wrongly written byte is the least significant byte of the 'dnsclass' argument; most commonly 1. We have been seen proof of concept code showing how this can be exploited in a real-world system, but we are not aware of any such instances having actually happened in the wild. INFO ---- The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2016-5180 to this issue. AFFECTED VERSIONS ----------------- This flaw exists in the following c-ares versions. - Affected versions: libcurl 1.0.0 to and including 1.11.0 - Not affected versions: c-ares >= 1.12.0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/c-ares/+bug/1629085/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
