Input validation error in Python - CVE-2013-4238
Published: October 25, 2019 / Updated: June 3, 2025
Vulnerability identifier: #VU110148
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2013-4238
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to corrupt data.
The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a ' ' 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.
Affected software
Python
How to mitigate CVE-2013-4238
Install update from vendor's website.
External References
- http://bugs.python.org/issue18709
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00026.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00027.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00028.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00029.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00042.html
- http://lists.opensuse.org/opensuse-updates/2013-09/msg00043.html
- 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-1982-1
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- https://bugzilla.redhat.com/show_bug.cgi?id=996381