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 (5)
Core 5
Core References
Vendor Advisory x_refsource_confirm
http://curl.haxx.se/docs/adv_20131217.html
Vendor Advisory x_refsource_confirm
http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
Various Sources vendor-advisory
x_refsource_hp
https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
Third Party Advisory vendor-advisory
x_refsource_debian
http://www.debian.org/security/2013/dsa-2824
Vendor Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2058-1
Scores
EPSS
0.0025
EPSS Percentile
48.7%
Details
CWE
CWE-20
Status
published
Products (23)
canonical/ubuntu_linux
12.04
canonical/ubuntu_linux
12.10
canonical/ubuntu_linux
13.04
canonical/ubuntu_linux
13.10
debian/debian_linux
7.0
haxx/libcurl
7.21.4
haxx/libcurl
7.21.5
haxx/libcurl
7.21.6
haxx/libcurl
7.21.7
haxx/libcurl
7.22.0
... and 13 more
Published
Dec 23, 2013
Tracked Since
Feb 18, 2026