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CVE-2024-7592

Low severity vulnerability in CPython's cookie parser causing CPU excess.

  • CVSS 7.5
  • CWE-1333
  • Resource Management
  • Remote

There is a LOW severity vulnerability affecting CPython, specifically the 'http.cookies' standard library module. When parsing cookies that contained backslashes for quoted characters in the cookie value, the parser would use an algorithm with quadratic complexity, resulting in excess CPU resources being used while parsing the value.

CVE
CVE-2024-7592
CWE
CWE-1333
CVSS base score
7.5
Published
2024-08-19
OWASP
A09 Security Logging and Monitoring Failures
Orthogonal defect classification
Algorithm
Code defect classification
Incorrect Algorithm
Category
Resource Management
Subcategory
Resource Exhaustion
Accessibility scope
Remote
Impact
Denial of Service (DoS)
Affected component
http.cookies
Fixed by upgrading
Yes

Solution

Upgrade to CPython version 3.10.1 or later.

Vulnerable code sample

import http.cookies

cookie_string = 'Set-Cookie: test="value with backslashes \\\\"'

cookie = http.cookies.SimpleCookie()
cookie.load(cookie_string)

print(cookie['test'].value)

Patched code sample

import http.cookies

def load_cookie(cookie_string):
    cookie = http.cookies.SimpleCookie()
    try:
        cookie.load(cookie_string)
    except http.cookies.CookieError:
        return None
    return cookie

cookie_string = 'Set-Cookie: test="value with backslashes \\\\"'

cookie = load_cookie(cookie_string)

if cookie and 'test' in cookie:
    print(cookie['test'].value)
else:
    print("Invalid or unsafe cookie")

Payload

Set-Cookie: test="value with backslashes \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Cite this entry

@misc{vaitp:cve20247592,
  title        = {{Low severity vulnerability in CPython's cookie parser causing CPU excess.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-7592},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-7592/}}
}
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