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Vulnerability Details : CVE-2013-6422

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.
Publish Date : 2013-12-23 Last Update Date : 2016-04-07
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity High (Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)

- Related OVAL Definitions

Title Definition Id Class Family
DSA-2824-1 curl - unchecked tls/ssl certificate host name oval:org.mitre.oval:def:20136 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2013-6422

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 12.04 - LTS Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 12.10 Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 13.04 Version Details Vulnerabilities
4 OS Canonical Ubuntu Linux 13.10 Version Details Vulnerabilities
5 OS Debian Debian Linux 7.0 Version Details Vulnerabilities
6 Application Haxx Libcurl 7.21.4 Version Details Vulnerabilities
7 Application Haxx Libcurl 7.21.5 Version Details Vulnerabilities
8 Application Haxx Libcurl 7.21.6 Version Details Vulnerabilities
9 Application Haxx Libcurl 7.21.7 Version Details Vulnerabilities
10 Application Haxx Libcurl 7.22.0 Version Details Vulnerabilities
11 Application Haxx Libcurl 7.23.0 Version Details Vulnerabilities
12 Application Haxx Libcurl 7.23.1 Version Details Vulnerabilities
13 Application Haxx Libcurl 7.24.0 Version Details Vulnerabilities
14 Application Haxx Libcurl 7.25.0 Version Details Vulnerabilities
15 Application Haxx Libcurl 7.26.0 Version Details Vulnerabilities
16 Application Haxx Libcurl 7.27.0 Version Details Vulnerabilities
17 Application Haxx Libcurl 7.28.0 Version Details Vulnerabilities
18 Application Haxx Libcurl 7.28.1 Version Details Vulnerabilities
19 Application Haxx Libcurl 7.29.0 Version Details Vulnerabilities
20 Application Haxx Libcurl 7.30.0 Version Details Vulnerabilities
21 Application Haxx Libcurl 7.31.0 Version Details Vulnerabilities
22 Application Haxx Libcurl 7.32.0 Version Details Vulnerabilities
23 Application Haxx Libcurl 7.33.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 4
Debian Debian Linux 1
Haxx Libcurl 18

- References For CVE-2013-6422 CONFIRM

- Metasploit Modules Related To CVE-2013-6422

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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