Python up to 3.4 SSL Module subjectAltNames input validation

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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Python. Affected by this issue is some unknown functionality of the component SSL Module. Such manipulation of the argument subjectAltNames with the input %00 as part of NULL Byte leads to input validation. This vulnerability is documented as CVE-2013-4238. Additionally, an exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Python (Programming Language Software). Affected by this issue is some unknown functionality of the component SSL Module. The manipulation of the argument subjectAltNames with the input value %00 leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, and integrity. CVE summarizes:

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.

The weakness was released 08/12/2013 by Ryan Sleevi with Google Chrome Security as Issue18709 as not defined bug report (Website) via Python Software Foundation. The advisory is shared for download at bugs.python.org. This vulnerability is handled as CVE-2013-4238 since 06/12/2013. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The advisory points out:

It's related to Ruby's CVE-2013-4073.

A public exploit has been developed by Christian Heimes in SSL Cert and been published 12 hours after the advisory. The exploit is available at bugs.python.org. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 70266 (Ubuntu 10.04 LTS : python2.6 vulnerability (USN-1982-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350503 (Amazon Linux Security Advisory for python26: ALAS-2013-241).

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the databases at X-Force (86383), Tenable (70266), SecurityFocus (BID 61738†), OSVDB (96215†) and Secunia (SA54393†). seclists.org is providing further details. Entry connected to this vulnerability is available at VDB-9971. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.8
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Christian Heimes
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 70266
Nessus Name: Ubuntu 10.04 LTS : python2.6 vulnerability (USN-1982-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 702880
OpenVAS Name: Debian Security Advisory DSA 2880-1 (python2.7 - security update
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

06/12/2013 🔍
08/12/2013 +61 days 🔍
08/12/2013 +0 days 🔍
08/12/2013 +0 days 🔍
08/13/2013 +0 days 🔍
08/15/2013 +2 days 🔍
08/17/2013 +2 days 🔍
10/02/2013 +46 days 🔍
12/06/2014 +430 days 🔍
12/07/2014 +1 days 🔍
05/21/2021 +2357 days 🔍

Sourcesinfo

Advisory: Issue18709
Researcher: Ryan Sleevi
Organization: Google Chrome Security
Status: Not defined
Confirmation: 🔍

CVE: CVE-2013-4238 (🔍)
GCVE (CVE): GCVE-0-2013-4238
GCVE (VulDB): GCVE-100-9956

OVAL: 🔍

X-Force: 86383
SecurityFocus: 61738 - Python SSL Module CVE-2013-4238 Security Bypass Vulnerability
Secunia: 54393 - Python Multiple Vulnerabilities, Less Critical
OSVDB: 96215
Vulnerability Center: 47431 - Python 2.6 - 3.4 SSL Module Remote Spoofing via Main-in-the-middle Attack by a Crafted Certificate, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 08/15/2013 18:10
Updated: 05/21/2021 14:43
Changes: 08/15/2013 18:10 (93), 06/13/2017 09:14 (4), 05/21/2021 14:43 (3)
Complete: 🔍
Cache ID: 216:6BC:103

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