Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2013-6422

Severity CVSS v4.0:
Pending analysis
Type:
CWE-20 Input Validation
Publication date:
23/12/2013
Last modified:
11/04/2025

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.

Impact

Vector 2.0
AV:N/AC:H/Au:N/C:P/I:P/A:N CVSS v2.0 Severity and Metrics:

Base Score: 4.00 MEDIUM
Vector: AV:N/AC:H/Au:N/C:P/I:P/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): None

Base Score 2.0
4.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.4:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.5:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.6:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.7:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.22.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.23.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.23.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.24.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.25.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.26.0:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools