Python up to 2.7.17/3.8.0 urllib2 urllib.request.urlopen Query String injection

Summaryinfo

A vulnerability was found in Python up to 2.7.17/3.8.0. It has been classified as critical. The impacted element is an unknown function in the library urllib.request.urlopen of the component urllib2. The manipulation as part of Query String leads to injection. This vulnerability is uniquely identified as CVE-2019-18348. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Python up to 2.7.17/3.8.0 (Programming Language Software). It has been rated as critical. This issue affects an unknown code block in the library urllib.request.urlopen of the component urllib2. The manipulation as part of a Query String leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.)

The weakness was disclosed 10/23/2019. The identification of this vulnerability is CVE-2019-18348 since 10/23/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 234998 (Amazon Linux AMI : python26 (ALAS-2025-1972)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (234998). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• Python

Version

• 2.7.0
• 2.7.1
• 2.7.2
• 2.7.3
• 2.7.4
• 2.7.5
• 2.7.6
• 2.7.7
• 2.7.8
• 2.7.9
• 2.7.10
• 2.7.11
• 2.7.12
• 2.7.13
• 2.7.14
• 2.7.15
• 2.7.16
• 2.7.17
• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
• 🔍
• 🔍

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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