ASA-2019-00517 – Apache HTTP Server: Stack buffer overflow and NULL pointer dereference in mod_remoteip

When mod_remoteip was configured to use a trusted intermediary proxy server using the "PROXY" protocol, a specially crafted PROXY header could trigger a stack buffer overflow or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by untrusted HTTP clients.

ASA-2019-00516 – Apache HTTP Server: mod_http2, DoS attack by exhausting h2 workers

A malicious client could perform a DoS attack by flooding a connection with requests and basically never reading responses on the TCP connection. Depending on h2 worker dimensioning, it was possible to block those with relatively few connections.

ASA-2019-00515 – Apache HTTP Server: mod_http2, memory corruption on early pushes

HTTP/2 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.

ASA-2019-00512 – Apache HTTP Server: Limited Cross-Site Scripting (XSS) in mod_proxy error page

A limited Cross-Site Scripting (XSS) issue was reported affecting the mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point to a page of their choice. This would only be exploitable where a server was set up with proxying enabled but was misconfigured in such a way that the Proxy Error page was displayed.

ASA-2019-00173 – Apache HTTP Server: URL normalization inconsistencies

When the path component of a request URL contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account for duplicates in regular expressions while other aspects of the servers processing will implicitly collapse them.

ASA-2019-00172 – Apache HTTP Server: mod_auth_digest access control bypass

In Apache HTTP Server 2.4 release 2.4.38 and prior, a race condition in mod_auth_digest when running in a threaded server could allow a user with valid credentials to authenticate using another username, bypassing configured access control restrictions.