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Improper Certificate Validation Affecting curl package, versions <7.74.0-1.3+deb11u9

0.0
medium

Snyk CVSS

    Attack Complexity High
    Integrity High

    Threat Intelligence

    EPSS 0.08% (32nd percentile)
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NVD
5.9 medium
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SUSE
4.3 medium
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Red Hat
5.9 medium

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  • Snyk ID SNYK-DEBIAN11-CURL-5561876
  • published 18 May 2023
  • disclosed 26 May 2023
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Introduced: 18 May 2023

CVE-2023-28321 Open this link in a new tab
CWE-295 Open this link in a new tab

How to fix?

Upgrade Debian:11 curl to version 7.74.0-1.3+deb11u9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS library. This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. Puny coded names always start with xn-- and should not be allowed to pattern match, but the wildcard check in curl could still check for x*, which would match even though the IDN name most likely contained nothing even resembling an x.

References