CVE-2013-6422

critical

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.

References

https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322

http://www.ubuntu.com/usn/USN-2058-1

http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html

http://www.debian.org/security/2013/dsa-2824

http://curl.haxx.se/docs/adv_20131217.html

Details

Source: Mitre, NVD

Published: 2013-12-23

Updated: 2016-04-07

Risk Information

CVSS v2

Base Score: 4

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical