Home/CVE/The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPE
CVE

CVE-2013-6422

The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPE

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.

MEDIUM · CVSS 4 EPSS 0.00253
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

3
debian linuxall versions
canonical ubuntu linuxall versions
haxx libcurlall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumPotential DLL Sideloading Of Libcurl.DLL Via GUP.EXE
▣

Scoring & Timeline

4
MEDIUM · CVSS v2 (legacy) · secalert@redhat.com
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:H/Au:N/C:P/I:P/A:N
Published to NVD23 Dec 2013 · 10:55 PM
⚑

Vendor Advisories

1
usnUSN-2058-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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