CPython up to 2.7.9/3.4.3 HTTP Header HTTPConnectionputheader response splitting

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability has been found in CPython up to 2.7.9/3.4.3 and classified as critical. This impacts the function HTTPConnectionputheader of the component HTTP Header Handler. This manipulation causes response splitting. This vulnerability is registered as CVE-2016-5699. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in CPython up to 2.7.9/3.4.3 (Programming Language Software). Affected by this vulnerability is the function HTTPConnectionputheader of the component HTTP Header Handler. The manipulation with an unknown input leads to a response splitting vulnerability. The CWE definition for the vulnerability is CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

CRLF injection vulnerability in the HTTPConnection.putheader function in urllib2 and urllib in CPython (aka Python) before 2.7.10 and 3.x before 3.4.4 allows remote attackers to inject arbitrary HTTP headers via CRLF sequences in a URL.

The weakness was published 09/02/2016 by Guido Vranken (Website). The advisory is shared at blog.blindspotsecurity.com. This vulnerability is known as CVE-2016-5699 since 06/16/2016. The exploitation appears to be easy. The attack can be launched remotely. A single authentication is necessary for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 93038 (OracleVM 3.3 / 3.4 : python (OVMSA-2016-0099) (httpoxy)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176661 (Debian Security Update for python3.4 (DLA 1663-1)).

Upgrading to version 2.7.10 or 3.4.4 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (93038) and SecurityFocus (BID 91226†). Similar entries are available at VDB-80763, VDB-88027, VDB-90422 and VDB-90620. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.1
VulDB Temp Score: 5.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Response splitting
CWE: CWE-113 / CWE-93 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 93038
Nessus Name: OracleVM 3.3 / 3.4 : python (OVMSA-2016-0099) (httpoxy)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 52997
OpenVAS Name: Cpython CRLF Injection Vulnerability (Windows)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: CPython 2.7.10/3.4.4

Timelineinfo

06/14/2016 🔍
06/16/2016 +2 days 🔍
08/18/2016 +63 days 🔍
08/19/2016 +1 days 🔍
09/02/2016 +14 days 🔍
09/02/2016 +0 days 🔍
09/03/2016 +1 days 🔍
09/14/2022 +2202 days 🔍

Sourcesinfo

Advisory: RHSA-2016:1626
Researcher: Guido Vranken
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-5699 (🔍)
GCVE (CVE): GCVE-0-2016-5699
GCVE (VulDB): GCVE-100-91045

OVAL: 🔍

SecurityFocus: 91226 - Python 'urrlib2/urllib/httplib/http.client' HTTP Header Injection Vulnerability

See also: 🔍

Entryinfo

Created: 09/03/2016 10:15
Updated: 09/14/2022 15:46
Changes: 09/03/2016 10:15 (66), 04/07/2019 16:24 (14), 09/14/2022 15:46 (3)
Complete: 🔍
Cache ID: 216:FC3:103

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