Python up to 3.7.2 Domain Validator Lib/http/cookiejar.py http.cookiejar.DefaultPolicy.domain_return_ok Hostname Cookie input validation

Summaryinfo

A vulnerability, which was classified as critical, was found in Python up to 3.7.2. The impacted element is the function http.cookiejar.DefaultPolicy.domain_return_ok in the library Lib/http/cookiejar.py of the component Domain Validator. Such manipulation as part of Hostname leads to input validation (Cookie). This vulnerability is traded as CVE-2018-20852. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Python up to 3.7.2 (Programming Language Software) and classified as critical. Affected by this issue is the function http.cookiejar.DefaultPolicy.domain_return_ok in the library Lib/http/cookiejar.py of the component Domain Validator. The manipulation as part of a Hostname leads to a input validation vulnerability (Cookie). 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, integrity, and availability. CVE summarizes:

http.cookiejar.DefaultPolicy.domain_return_ok in Lib/http/cookiejar.py in Python before 3.7.3 does not correctly validate the domain: it can be tricked into sending existing cookies to the wrong server. An attacker may abuse this flaw by using a server with a hostname that has another valid hostname as a suffix (e.g., pythonicexample.com to steal cookies for example.com). When a program uses http.cookiejar.DefaultPolicy and tries to do an HTTP connection to an attacker-controlled server, existing cookies can be leaked to the attacker. This affects 2.x through 2.7.16, 3.x before 3.4.10, 3.5.x before 3.5.7, 3.6.x before 3.6.9, and 3.7.x before 3.7.3.

The weakness was shared 07/13/2019 (Website). The advisory is shared for download at lists.fedoraproject.org. This vulnerability is handled as CVE-2018-20852 since 07/13/2019. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 3.7.3 eliminates this vulnerability.

The entry VDB-153334 is related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• Python

Version

• 3.7.0
• 3.7.1
• 3.7.2

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion