Headline
CVE-2023-49082: ClientSession is vulnerable to CRLF injection via method
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method. The vulnerability occurs only if the attacker can control the HTTP method (GET, POST etc.) of the request. If the attacker can control the HTTP version of the request it will be able to modify the request (request smuggling). This issue has been patched in version 3.9.0.
Summary
Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method.
Details
The vulnerability occurs only if the attacker can control the HTTP method (GET, POST etc.) of the request.
Previous releases performed no validation on the provided value. If an attacker controls the HTTP method it will be used as is and can lead to HTTP request smuggling.
PoC
A minimal example can be found here:
https://gist.github.com/jnovikov/7f411ae9fe6a9a7804cf162a3bdbb44b
Impact
If the attacker can control the HTTP version of the request it will be able to modify the request (request smuggling).
Workaround
If unable to upgrade and using user-provided values for the request method, perform manual validation of the user value (e.g. by restricting it to a few known values like GET, POST etc.).
Related news
Gentoo Linux Security Advisory 202408-11 - Multiple vulnerabilities have been discovered in aiohttp, the worst of which could lead to service compromise. Versions greater than or equal to 3.9.4 are affected.
Red Hat Security Advisory 2024-2010-03 - An update is now available for Red Hat Satellite 6.15. The release contains a new version of Satellite and important security fixes for various components. Issues addressed include HTTP request smuggling, crlf injection, denial of service, file disclosure, and traversal vulnerabilities.
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.
### Summary Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method. ### Details The vulnerability occurs only if the attacker can control the HTTP method (GET, POST etc.) of the request. Previous releases performed no validation on the provided value. If an attacker controls the HTTP method it will be used as is and can lead to HTTP request smuggling. ### PoC A minimal example can be found here: https://gist.github.com/jnovikov/7f411ae9fe6a9a7804cf162a3bdbb44b ### Impact If the attacker can control the HTTP version of the request it will be able to modify the request (request smuggling). ### Workaround If unable to upgrade and using user-provided values for the request method, perform manual validation of the user value (e.g. by restricting it to a few known values like GET, POST etc.).