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Security Advisories: GSA_kwCzR0hTQS1xM3F4LWM2ZzItN3B3Ms4AA3Yd
aiohttp's ClientSession is vulnerable to CRLF injection via version
Summary
Improper validation make it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or even create a new HTTP request if the attacker controls the HTTP version.
Details
The vulnerability only occurs if the attacker can control the HTTP version of the request (including its type).
For example if an unvalidated JSON value is used as a version and the attacker is then able to pass an array as the version parameter.
Furthermore, the vulnerability only occurs when the Connection header is passed to the headers parameter.
At this point, the library will use the parsed value to create the request. If a list is passed, then it bypasses validation and it is possible to perform CRLF injection.
PoC
The POC below shows an example of providing an unvalidated array as a version:
https://gist.github.com/jnovikov/184afb593d9c2114d77f508e0ccd508e
Impact
CRLF injection leading to Request Smuggling.
Workaround
If these specific conditions are met and you are unable to upgrade, then validate the user input to the version parameter to ensure it is a str.
Patch: https://github.com/aio-libs/aiohttp/pull/7835/files
Permalink: https://github.com/advisories/GHSA-q3qx-c6g2-7pw2JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1xM3F4LWM2ZzItN3B3Ms4AA3Yd
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 5 months ago
Updated: 3 months ago
CVSS Score: 7.2
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Identifiers: GHSA-q3qx-c6g2-7pw2, CVE-2023-49081
References:
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-q3qx-c6g2-7pw2
- https://gist.github.com/jnovikov/184afb593d9c2114d77f508e0ccd508e
- https://nvd.nist.gov/vuln/detail/CVE-2023-49081
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TY5SI6NK5243DEEDQUFKQKW5GQNKQUMA/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/WSYWMP64ZFCTC3VO6RY6EC6VSSMV6I3A/
- https://github.com/aio-libs/aiohttp/pull/7835/files
- https://github.com/aio-libs/aiohttp/commit/1e86b777e61cf4eefc7d92fa57fa19dcc676013b
- https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2023-250.yaml
- https://github.com/advisories/GHSA-q3qx-c6g2-7pw2
Blast Radius: 34.7
Affected Packages
pypi:aiohttp
Dependent packages: 4,004Dependent repositories: 66,431
Downloads: 107,102,656 last month
Affected Version Ranges: < 3.9.0
Fixed in: 3.9.0
All affected versions: 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.5.0, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4, 0.6.5, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.8.0, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.10.0, 0.10.1, 0.10.2, 0.11.0, 0.12.0, 0.13.0, 0.13.1, 0.14.0, 0.14.1, 0.14.2, 0.14.3, 0.14.4, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.16.0, 0.16.1, 0.16.2, 0.16.3, 0.16.4, 0.16.5, 0.16.6, 0.17.0, 0.17.1, 0.17.2, 0.17.3, 0.17.4, 0.18.0, 0.18.1, 0.18.2, 0.18.3, 0.18.4, 0.19.0, 0.20.0, 0.20.1, 0.20.2, 0.21.0, 0.21.1, 0.21.2, 0.21.4, 0.21.5, 0.21.6, 0.22.0, 0.22.1, 0.22.2, 0.22.3, 0.22.4, 0.22.5, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.5, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 1.1.6, 1.2.0, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.1.0, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7, 2.3.8, 2.3.9, 2.3.10, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.2.0, 3.2.1, 3.3.0, 3.3.1, 3.3.2, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.5.0, 3.5.1, 3.5.2, 3.5.3, 3.5.4, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.7.0, 3.7.1, 3.7.2, 3.7.3, 3.7.4, 3.8.0, 3.8.1, 3.8.2, 3.8.3, 3.8.4, 3.8.5, 3.8.6
All unaffected versions: 3.9.0, 3.9.1, 3.9.2, 3.9.3, 3.9.4, 3.9.5