CVE-2016-1000111

Twisted: sets environmental variable based on user supplied Proxy request header

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Twisted before 16.3.1 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue.

Twisted versiones anteriores a la versión 16.3.1, no intenta abordar los conflictos de espacio de nombres RFC 3875 sección 4.1.18 y, por lo tanto, no protege las aplicaciones CGI de la presencia de datos de clientes no seguros en la variable de entorno HTTP_PROXY, lo que podría permitir a atacantes remotos redireccionar un tráfico HTTP saliente de una aplicación CGI hacia un servidor proxy arbitrario por medio de un encabezado Proxy especialmente diseñado en una petición HTTP, también se conoce como un problema "httpoxy".

It was discovered that python-twisted-web used the value of the Proxy header from HTTP requests to initialize the HTTP_PROXY environment variable for CGI scripts, which in turn was incorrectly used by certain HTTP client implementations to configure the proxy for outgoing HTTP requests. A remote attacker could possibly use this flaw to redirect HTTP requests performed by a CGI script to an attacker-controlled proxy via a malicious HTTP request.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-07-18 CVE Reserved
2016-09-29 CVE Published
2023-05-08 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-425: Direct Request ('Forced Browsing')

CAPEC

References (6)

URL	Tag	Source
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html	Third Party Advisory
https://www.openwall.com/lists/oss-security/2016/07/18/6	Mailing List

URL	Date	SRC

URL	Date	SRC
https://twistedmatrix.com/trac/ticket/8623	2020-03-13

URL	Date	SRC
https://twistedmatrix.com/pipermail/twisted-web/2016-August/005268.html	2020-03-13
https://access.redhat.com/security/cve/CVE-2016-1000111	2018-02-05
https://bugzilla.redhat.com/show_bug.cgi?id=1357345	2018-02-05

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Twistedmatrix Search vendor "Twistedmatrix"		Twisted Search vendor "Twistedmatrix" for product "Twisted"				< 16.3.1 Search vendor "Twistedmatrix" for product "Twisted" and version " < 16.3.1"		-		Affected