CVE-2013-4238
The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof…
Does this matter?
Lower severity and a low EPSS score (5.35%). Track it; it rarely justifies an emergency change on its own.
Description
The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
- CVSS 2.0
- 4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
- EPSS
- 5.35% probability · 92th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- canonical/ubuntu linux · python/python · opensuse/opensuse
- Source
- secalert@redhat.com
References
- http://bugs.python.org/issue18709Patch
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.htmlVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2013-1582.html
- http://seclists.org/fulldisclosure/2014/Dec/23
- http://www.debian.org/security/2014/dsa-2880
- http://www.securityfocus.com/archive/1/534161/100/0/threaded
- http://www.ubuntu.com/usn/USN-1982-1Vendor Advisory
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- https://bugzilla.redhat.com/show_bug.cgi?id=996381Patch
- http://bugs.python.org/issue18709Patch
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.htmlVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.htmlVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2013-1582.html
- http://seclists.org/fulldisclosure/2014/Dec/23
- http://www.debian.org/security/2014/dsa-2880
- http://www.securityfocus.com/archive/1/534161/100/0/threaded
- http://www.ubuntu.com/usn/USN-1982-1Vendor Advisory
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- https://bugzilla.redhat.com/show_bug.cgi?id=996381Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.