Varnish Enterprise before 6.0.13r13 allows remote attackers to obtain sensitive information via an out-of-bounds read for range requests on ephemeral MSE4 stevedore objects.
This vulnerability may allow for request smuggling attacks, potentially resulting in an unspecified system caching incorrect content.
The bug is an error in how to parse a chunked message body. The RFC tells to use only CRLF sequence to end a line: https://www.rfc-editor.org/rfc/rfc9112.html#name-chunked-transfer-coding However, Varnish has up until now mistakenly treated white-spaces as line ending as well. This allows a client to construct a HTTP/1 request to smuggle another malicious request in the body of the first request. When this is used against an endpoint that is blindly forwarding HTTP requests, it can lead to ways for this client to abuse this behavior of Varnish.
Varnish before 3.0.5 allows remote attackers to cause a denial of service (child-process crash and temporary caching outage) via a GET request with trailing whitespace characters and no URI.
An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.
End of life: 3/15/2025, Latest version: 7.5.0
End of life: 3/15/2025, Latest version: 7.5.0
End of life: 9/15/2024, Latest version: 7.4.3
End of life: 9/15/2024, Latest version: 7.4.3
End of life: 3/15/2024, Latest version: 7.3.2
End of life: 3/15/2024, Latest version: 7.3.2
End of life: 9/15/2023, Latest version: 7.2.1
End of life: 9/15/2023, Latest version: 7.2.1
End of life: 3/15/2023, Latest version: 7.1.2
End of life: 3/15/2023, Latest version: 7.1.2
End of life: 9/15/2022, Latest version: 7.0.3
End of life: 9/15/2022, Latest version: 7.0.3