Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
High
Attack Vector
Adjacent_network
0

CVE-2023-45803

Disclosure Date: October 17, 2023 •
CVE-2023-45803 CVSS v3 Base Score: 4.2
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

urllib3 is a user-friendly HTTP client library for Python. urllib3 previously wouldn’t remove the HTTP request body when an HTTP redirect response using status 301, 302, or 303 after the request had its method changed from one that could accept a request body (like POST) to GET as is required by HTTP RFCs. Although this behavior is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers. Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren’t putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn’t exploitable. Both of the following conditions must be true to be affected by this vulnerability: 1. Using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON) and 2. The origin service is compromised and starts redirecting using 301, 302, or 303 to a malicious peer or the redirected-to service becomes compromised. This issue has been addressed in versions 1.26.18 and 2.0.7 and users are advised to update to resolve this issue. Users unable to update should disable redirects for services that aren’t expecting to respond with redirects with redirects=False and disable automatic redirects with redirects=False and handle 301, 302, and 303 redirects manually by stripping the HTTP request body.

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CVSS V3 Severity and Metrics
Base Score:
4.2 Medium
Impact Score:
3.6
Exploitability Score:
0.5
Vector:
CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack Vector (AV):
Adjacent_network
Attack Complexity (AC):
High
Privileges Required (PR):
High
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
None
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
urllib3 >= 2.0.0, < 2.0.7
urllib3 < 1.26.18
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • fedoraproject,
  • python

Products

  • fedora 38,
  • urllib3
Technical Analysis