The Apache httpd project reports:

low: DoS for HTTP/2 connections by continuous SETTINGS

By sending continous SETTINGS frames of maximum size an ongoing HTTP/2 connection could be kept busy and would never time out. This can be abused for a DoS on the server. This only affect a server that has enabled the h2 protocol.

< 2.4.35

The Apache httpd project reports:

important: Read after free in mod_http2 (CVE-2017-9789)

When under stress, closing many connections, the HTTP/2 handling code would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.

important: Uninitialized memory reflection in mod_auth_digest (CVE-2017-9788)

The value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments. by mod_auth_digest.

Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault.

< 2.4.27

Jim Jagielski reports:

CVE-2015-3183 (cve.mitre.org) core: Fix chunk header parsing defect. Remove apr_brigade_flatten(), buffering and duplicated code from the HTTP_IN filter, parse chunks in a single pass with zero copy. Limit accepted chunk-size to 2^63-1 and be strict about chunk-ext authorized characters.

CVE-2015-3185 (cve.mitre.org) Replacement of ap_some_auth_required (unusable in Apache httpd 2.4) with new ap_some_authn_required and ap_force_authn hook.

CVE-2015-0253 (cve.mitre.org) core: Fix a crash with ErrorDocument 400 pointing to a local URL-path with the INCLUDES filter active, introduced in 2.4.11. PR 57531.

CVE-2015-0228 (cve.mitre.org) mod_lua: A maliciously crafted websockets PING after a script calls r:wsupgrade() can cause a child process crash.

< 2.4.16

The Fuzzing Project reports:

Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.

< 2.4.27_1

< 2.2.34_1

Apache Software Foundation reports:

Please reference CVE/URL list for details

< 2.4.25

The Apache httpd project reports:

• ap_get_basic_auth_pw() Authentication Bypass (CVE-2017-3167):
  
  Use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed.
• mod_ssl Null Pointer Dereference (CVE-2017-3169):
  
  mod_ssl may dereference a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port.
• mod_http2 Null Pointer Dereference (CVE-2017-7659):
  
  A maliciously constructed HTTP/2 request could cause mod_http2 to dereference a NULL pointer and crash the server process.
• ap_find_token() Buffer Overread (CVE-2017-7668):
  
  The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.
• mod_mime Buffer Overread (CVE-2017-7679):
  
  mod_mime can read one byte past the end of a buffer when sending a malicious Content-Type response header.

< 2.2.33

< 2.4.26

The Apache httpd reports:

Out of bound write in mod_authnz_ldap with AuthLDAPCharsetConfig enabled (CVE-2017-15710)

mod_session: CGI-like applications that intend to read from mod_session's 'SessionEnv ON' could be fooled into reading user-supplied data instead. (CVE-2018-1283)

mod_cache_socache: Fix request headers parsing to avoid a possible crash with specially crafted input data. (CVE-2018-1303)

core: Possible crash with excessively long HTTP request headers. Impractical to exploit with a production build and production LogLevel. (CVE-2018-1301)

core: Configure the regular expression engine to match '$' to the end of the input string only, excluding matching the end of any embedded newline characters. Behavior can be changed with new directive 'RegexDefaultOptions'. (CVE-2017-15715)

mod_auth_digest: Fix generation of nonce values to prevent replay attacks across servers using a common Digest domain. This change may cause problems if used with round robin load balancers. (CVE-2018-1312)

mod_http2: Potential crash w/ mod_http2. (CVE-2018-1302)

< 2.4.30

< 2.2.34_5

The Apache project reports:

• DoS for HTTP/2 connections by crafted requests (CVE-2018-1333). By specially crafting HTTP/2 requests, workers would be allocated 60 seconds longer than necessary, leading to worker exhaustion and a denial of service. (low)
• mod_md, DoS via Coredumps on specially crafted requests (CVE-2018-8011). By specially crafting HTTP requests, the mod_md challenge handler would dereference a NULL pointer and cause the child process to segfault. This could be used to DoS the server. (moderate)

< 2.4.34

The Apache httpd Project reports:

SECURITY: CVE-2018-17199 mod_session: mod_session_cookie does not respect expiry time allowing sessions to be reused.

SECURITY: CVE-2019-0190 mod_ssl: Fix infinite loop triggered by a client-initiated renegotiation in TLSv1.2 (or earlier) with OpenSSL 1.1.1 and later. PR 63052.

SECURITY: CVE-2018-17189 mod_http2: fixes a DoS attack vector. By sending slow request bodies to resources not consuming them, httpd cleanup code occupies a server thread unnecessarily. This was changed to an immediate stream reset which discards all stream state and incoming data.

< 2.4.38

The Apache httpd Project reports:

Apache HTTP Server privilege escalation from modules' scripts (CVE-2019-0211) (important)

mod_auth_digest access control bypass (CVE-2019-0217) (important)

mod_ssl access control bypass (CVE-2019-0215) (important)

mod_http2, possible crash on late upgrade (CVE-2019-0197) (low)

mod_http2, read-after-free on a string compare (CVE-2019-0196) (low)

Apache httpd URL normalization inconsistincy (CVE-2019-0220) (low)

< 2.4.39

SO-AND-SO reports:

SECURITY: CVE-2019-10081

mod_http2: 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.

SECURITY: CVE-2019-9517

mod_http2: 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.

SECURITY: CVE-2019-10098

rewrite, core: Set PCRE_DOTALL flag by default to avoid unpredictable matches and substitutions with encoded line break characters.

SECURITY: CVE-2019-10092

Remove HTML-escaped URLs from canned error responses to prevent misleading text/links being displayed via crafted links.

SECURITY: CVE-2019-10097

mod_remoteip: Fix stack buffer overflow and NULL pointer deference when reading the PROXY protocol header.

CVE-2019-10082

mod_http2: Using fuzzed network input, the http/2 session handling could be made to read memory after being freed, during connection shutdown.

< 2.4.41