--- title: "CVE-2013-6422\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2013-6422?format=md keywords: index, follow --- # CVE-2013-6422 Publication date 17 December 2013 Last updated 24 July 2024 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT\_SSL\_VERIFYPEER), also disables the CURLOPT\_SSL\_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks. [Read the notes from the security team](https://ubuntu.com/security/CVE-2013-6422?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | curl | 13.10 saucy | Fixed 7.32.0-1ubuntu1.2 | | 13.04 raring | Fixed 7.29.0-1ubuntu3.4 | | 12.10 quantal | Fixed 7.27.0-1ubuntu1.7 | | 12.04 LTS precise | Fixed 7.22.0-3ubuntu4.6 | | 10.04 LTS lucid | Not affected | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## Notes --- ### [seth-arnold](https://launchpad.net/~seth-arnold) Similar to but different from CVE-2013-4545 ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-6422) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2013-6422) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2013-6422) * [Debian](https://security-tracker.debian.org/tracker/CVE-2013-6422) ### Related Ubuntu Security Notices (USN) + [USN-2058-1](https://usn.ubuntu.com/USN-2058-1) + curl vulnerability + 18 December 2013 ### Other references * *