CVE-2014-0105
Python-keystoneclient before 0.7.0 allows authenticated remote users to gain privileges via a memcache-related issue
- CVSS 6.0
- CWE-255
- Authentication, Authorization, and Session Management
- Remote
The auth_token middleware in the OpenStack Python client library for Keystone (aka python-keystoneclient) before 0.7.0 does not properly retrieve user tokens from memcache, which allows remote authenticated users to gain privileges in opportunistic circumstances via a large number of requests, related to an "interaction between eventlet and python-memcached."
- CWE
- CWE-255
- CVSS base score
- 6.0
- Published
- 2014-04-15
- OWASP
- A07 Identification and Authentication Failures
- Orthogonal defect classification
- Function
- Code defect classification
- Incorrect Functionality
- Category
- Authentication, Authorization, and Session Management
- Subcategory
- Privilege Escalation
- Accessibility scope
- Remote
- Impact
- Privilege Escalation
- Fixed by upgrading
- Yes
Solution
Update python-keystoneclient to version 0.7.0 or higher.
Vulnerable code sample
import memcache
class AuthTokenMiddleware:
def __init__(self, app, memcache_servers):
self.app = app
self.cache = memcache.Client(memcache_servers)
def get_user_token(self, user_id):
token = self.cache.get(f'user_token:{user_id}')
return token
def __call__(self, environ, start_response):
user_id = environ.get('HTTP_X_USER_ID')
if not user_id:
start_response('401 Unauthorized', [])
return [b'Unauthorized']
token = self.get_user_token(user_id)
if not token:
start_response('404 Not Found', [])
return [b'Token not found']
environ['AUTH_TOKEN'] = token
return self.app(environ, start_response)Patched code sample
import memcache
import re
class AuthTokenMiddleware:
def __init__(self, app, memcache_servers):
self.app = app
self.cache = memcache.Client(memcache_servers)
def get_user_token(self, user_id):
try:
return self.cache.get(f'user_token:{user_id}')
except Exception:
return None
def sanitize_user_id(self, user_id):
if not re.match(r'^[a-zA-Z0-9_]+$', user_id):
return None
return user_id
def __call__(self, environ, start_response):
user_id = environ.get('HTTP_X_USER_ID')
if not user_id:
start_response('401 Unauthorized', [])
return [b'Unauthorized: Missing user ID']
user_id = self.sanitize_user_id(user_id)
if not user_id:
start_response('400 Bad Request', [])
return [b'Bad Request: Invalid user ID']
token = self.get_user_token(user_id)
if not token:
start_response('404 Not Found', [])
return [b'Token not found']
environ['AUTH_TOKEN'] = token
return self.app(environ, start_response)Cite this entry
@misc{vaitp:cve20140105,
title = {{Python-keystoneclient before 0.7.0 allows authenticated remote users to gain privileges via a memcache-related issue}},
author = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
year = {2014},
note = {VAITP Python Vulnerability Dataset, entry CVE-2014-0105},
howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2014-0105/}}
}Introducing the "VAITP dataset": a specialized repository of Python vulnerabilities and patches, meticulously compiled for the use of the security research community. As Python's prominence grows, understanding and addressing potential security vulnerabilities become crucial. Crafted by and for the cybersecurity community, this dataset offers a valuable resource for researchers, analysts, and developers to analyze and mitigate the security risks associated with Python. Through the comprehensive exploration of vulnerabilities and corresponding patches, the VAITP dataset fosters a safer and more resilient Python ecosystem, encouraging collaborative advancements in programming security.
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