Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVE-2022-45060
Summary
An HTTP Request Forgery issue was discovered in Varnish Cache 5.x and 6.x prior to 6.0.11, 7.x prior to 7.1.2, and 7.2.x prior to 7.2.1. An attacker may introduce characters through HTTP/2 pseudo-headers that are invalid in the context of an HTTP/1 request line, causing the Varnish server to produce invalid HTTP/1 requests to the backend. This could, in turn, be used to exploit vulnerabilities in a server behind the Varnish server. Note: the 6.0.x LTS series (prior to 6.0.11) is affected.
- LOW
- NETWORK
- HIGH
- UNCHANGED
- NONE
- NONE
- NONE
- NONE
CWE-444 - HTTP Request Smuggling
Entities such as web servers, web caching proxies, and application firewalls could parse HTTP requests differently. When there are two or more such entities in the path of an HTTP request, an attacker can send a specially crafted HTTP request that is seen as two different sets of requests by the attacked devices, allowing the attacker to smuggle a request into one device without the other device being aware of it. Such a vulnerability can prove devastating, for it enables further attacks on the application, like web cache poisoning, session hijacking, cross-site scripting, security bypassing, and sensitive information exposure.
Advisory Timeline
- Published