Python up to 2.7.16/3.7.2 urllib/urllib2 urllib.request.urlopen HTTP Header crlf injection

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Python up to 2.7.16/3.7.2. Affected by this vulnerability is an unknown functionality in the library urllib.request.urlopen of the component urllib/urllib2. The manipulation as part of HTTP Header leads to crlf injection. This vulnerability is referenced as CVE-2019-9740. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Python up to 2.7.16/3.7.2 (Programming Language Software). It has been rated as critical. This issue affects an unknown functionality in the library urllib.request.urlopen of the component urllib/urllib2. The manipulation as part of a HTTP Header leads to a crlf injection vulnerability. Using CWE to declare the problem leads to CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.2. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n followed by an HTTP header or a Redis command.

The bug was discovered 03/13/2019. The weakness was published 03/13/2019 (Website). It is possible to read the advisory at securityfocus.com. The identification of this vulnerability is CVE-2019-9740 since 03/12/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 236633 (Alibaba Cloud Linux 3 : 0112: python27:2.7 (ALINUX3-SA-2022:0112)), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 237250 (Red Hat Update for python27-python and python27-python-jinja2 (RHSA-2019:1260)).

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 databases at Tenable (236633) and SecurityFocus (BID 105396†). Similar entries are available at VDB-109585, VDB-113041, VDB-119652 and VDB-119653. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.1
VulDB Temp Score: 7.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 236633
Nessus Name: Alibaba Cloud Linux 3 : 0112: python27:2.7 (ALINUX3-SA-2022:0112)

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/22/2018 🔍
03/12/2019 +171 days 🔍
03/13/2019 +1 days 🔍
03/13/2019 +0 days 🔍
03/13/2019 +0 days 🔍
05/19/2025 +2259 days 🔍

Sourcesinfo

Advisory: RHSA-2019:1260⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-9740 (🔍)
GCVE (CVE): GCVE-0-2019-9740
GCVE (VulDB): GCVE-100-131615
SecurityFocus: 105396 - Python CVE-2018-14647 Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/13/2019 07:07
Updated: 05/19/2025 19:40
Changes: 03/13/2019 07:07 (60), 05/15/2020 17:51 (5), 07/31/2023 17:37 (3), 05/19/2025 19:40 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!