Apache 2.4.x < 2.4.41 Multiple Vulnerabilities
Medium Nessus Plugin ID 128033
SynopsisThe remote web server is affected by multiple vulnerabilities.
DescriptionThe version of Apache httpd installed on the remote host is prior to 2.4.41. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.41 advisory.
- HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with H2PushResource, could lead to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of the configured push link header values, not data supplied by the client. (CVE-2019-10081)
- Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint;
however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire.
The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
SolutionUpgrade to Apache version 2.4.41 or later.