Headline
GHSA-q3qx-c6g2-7pw2: 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
.
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.
References
- GHSA-q3qx-c6g2-7pw2
- https://gist.github.com/jnovikov/184afb593d9c2114d77f508e0ccd508e
Related news
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Red Hat Security Advisory 2024-1878-03 - An updated version of Red Hat Update Infrastructure is now available. RHUI 4.8 fixes several security an operational bugs, adds some new features and upgrades the underlying Pulp to a newer version. Issues addressed include HTTP request smuggling, crlf injection, denial of service, and traversal vulnerabilities.
Red Hat Security Advisory 2024-1057-03 - An update is now available for Red Hat Ansible Automation Platform 2.4. Issues addressed include crlf injection and denial of service vulnerabilities.
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation made it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or create a new HTTP request if the attacker controls the HTTP version. The vulnerability only occurs if the attacker can control the HTTP version of the request. This issue has been patched in version 3.9.0.