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…
Does this matter?
Lower severity and a low EPSS score (2.80%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 2.0
- 4.0 MEDIUMAV:N/AC:H/Au:N/C:P/I:P/A:N
- EPSS
- 2.80% probability · 86th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- debian/debian linux · canonical/ubuntu linux · haxx/libcurl
- Source
- secalert@redhat.com
References
- http://curl.haxx.se/docs/adv_20131217.htmlVendor Advisory
- http://www.debian.org/security/2013/dsa-2824
- http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
- http://www.ubuntu.com/usn/USN-2058-1
- https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
- http://curl.haxx.se/docs/adv_20131217.htmlVendor Advisory
- http://www.debian.org/security/2013/dsa-2824
- http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
- http://www.ubuntu.com/usn/USN-2058-1
- https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.