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CVE-2014-7143

Python Twisted 14.0 HTTP client ignores trustRoot, causing a security vulnerability

  • CVSS 7.5
  • CWE-295 Improper Certificate Validation
  • Authentication, Authorization, and Session Management
  • Remote

Python Twisted 14.0 trustRoot is not respected in HTTP client

CVE
CVE-2014-7143
CWE
CWE-295 Improper Certificate Validation
CVSS base score
7.5
Published
2019-11-12
OWASP
A05 Security Misconfiguration
Orthogonal defect classification
Function
Code defect classification
Incorrect Functionality
Category
Authentication, Authorization, and Session Management
Subcategory
Insecure Authentication Mechanisms
Accessibility scope
Remote
Impact
Unauthorized Access
Fixed by upgrading
Yes

Solution

Update Twisted to version 14.0.1 or higher.

Vulnerable code sample

from twisted.web.client import Agent
from twisted.internet import reactor
from twisted.internet.defer import inlineCallbacks
from twisted.web.http_headers import Headers

class AgentClass(Agent):
    def __init__(self, reactor, contextFactory=None):
        super().__init__(reactor, contextFactory)

@inlineCallbacks
def fetch_url(url):
    agent = AgentClass(reactor)
    response = yield agent.request(
        b'GET',
        url.encode('utf-8'),
        Headers({'User -Agent': ['Twisted Web Client']}),
        None
    )
    print("Response code:", response.code)

fetch_url("https://example.com")
reactor.run()

Patched code sample

from twisted.web.client import Agent
from twisted.web.http import BrowserLikePolicyForHTTPS
from twisted.internet import reactor
from twisted.internet.defer import inlineCallbacks
from twisted.web.http_headers import Headers
from twisted.web.http import Request

class AgentClass(Agent):
    def __init__(self, reactor, contextFactory=None):
        super().__init__(reactor, contextFactory)
        self.trustRoot = BrowserLikePolicyForHTTPS()

@inlineCallbacks
def fetch_url(url):
    agent = AgentClass(reactor)
    response = yield agent.request(
        b'GET',
        url.encode('utf-8'),
        Headers({'User -Agent': ['Twisted Web Client']}),
        None
    )
    print("Response code:", response.code)

fetch_url("https://example.com")
reactor.run()

Cite this entry

@misc{vaitp:cve20147143,
  title        = {{Python Twisted 14.0 HTTP client ignores trustRoot, causing a security vulnerability}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2019},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2014-7143},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2014-7143/}}
}
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