CVE-2017-9788

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, 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 in other cases resulting in denial of service.

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, 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 in other cases resulting in denial of service.

In Apache httpd before 2.4.27, 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 in other cases resulting in denial of service (CVE-2017-9788).

When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behavior (CVE-2017-9789).

mod_sessioncrypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC (CVE-2016-0736).

Malicious input to mod_auth_digest will cause the server to crash, and each instance continues to crash even for subsequently valid requests (CVE-2016-2161).

Emmanuel Dreyfus reported that the use of ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may lead to authentication requirements being bypassed (CVE-2017-3167).

Vasileios Panopoulos of AdNovum Informatik AG discovered that mod_ssl may dereference a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port leading to a denial of service (CVE-2017-3169).

Javier Jimenez reported that the HTTP strict parsing contains a flaw leading to a buffer overread in ap_find_token(). A remote attacker can take advantage of this flaw by carefully crafting a sequence of request headers to cause a segmentation fault, or to force ap_find_token() to return an incorrect value (CVE-2017-7668).

ChenQin and Hanno Boeck reported that mod_mime can read one byte past the end of a buffer when sending a malicious Content-Type response header (CVE-2017-7679).

Robert Swiecki reported that mod_auth_digest does not properly initialize or reset the value placeholder in [Proxy-]Authorization headers of type "Digest" between successive key=value assignments, leading to information disclosure or denial of service (CVE-2017-9788).

Hanno Böck discovered that the Apache HTTP Server incorrectly handled Limit directives in .htaccess files. In certain configurations, a remote attacker could possibly use this issue to read arbitrary server memory, including sensitive information. This issue is known as Optionsbleed (CVE-2017-9798).

This update for apache2 fixes the following issues:

Security issue fixed:

• CVE-2017-9788: Uninitialized memory reflection in mod_auth_digest. (bsc#1048576)

Bug fixes:

• Include individual sysconfig.d files instead of the whole sysconfig.d directory.
• Include sysconfig.d/include.conf after httpd.conf is processed. (bsc#1023616, bsc#1043055)

This update provides apache2 2.2.34, which brings many fixes and enhancements:

Security issues fixed:

• CVE-2017-9788: Uninitialized memory reflection in mod_auth_digest. (bsc#1048576)

Bug fixes:

• Remove /usr/bin/http2 link only during package uninstall, not upgrade. (bsc#1041830)
• Don't put the backend in error state (by default) when 500/503 error code is overridden. (bsc#951692)
• Allow single-char field names inadvertently disallowed in 2.2.32.

This update for apache2 provides the following fixes:

Security issues fixed:

• 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 in other cases resulting in denial of service. (bsc#1048576)
• CVE-2017-7679: mod_mime could have read one byte past the end of a buffer when sending a malicious Content-Type response header leading to information leak or crash. (bsc#1045060)
• CVE-2017-3169: mod_ssl may have dereferenced a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port leading to crash. (bsc#1045062)
• CVE-2017-3167: Use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may have lead to authentication requirements being bypassed. (bsc#1045065)

Non-security issues fixed:

• Re-order cipher suites to keep exclusion list at the end. (bsc#1043484, bsc#1043607)
• Remove /usr/bin/http2 link only during apache2 package uninstall, not upgrade. (bsc#1041830)
• In gensslcert, use hostname when fqdn is too long. (bsc#1035829)

This update for apache2 fixes several issues.

These security issues were fixed:

• CVE-2017-9798: Prevent use-after-free use of memory that allowed for an information leak via OPTIONS (bsc#1058058)
• CVE-2017-9788: Uninitialized memory reflection in mod_auth_digest could have lead to leakage of potentially confidential information, and a segfault in other cases resulting in DoS (bsc#1048576).
• CVE-2017-7679: mod_mime could have read one byte past the end of a buffer when sending a malicious Content-Type response header (bsc#1045060).
• CVE-2017-3169: mod_ssl may dereferenced a NULL pointer when third-party modules call ap_hook_process_connection() during an HTTP request to an HTTPS port allowing for DoS (bsc#1045062).
• CVE-2017-3167: Use of the ap_get_basic_auth_pw() by third-party modules outside of the authentication phase may have lead to authentication requirements being bypassed (bsc#1045065).

These non-security issues were fixed:

• remove /usr/bin/http2 symlink only during apache2 package uninstall, not upgrade (bsc#1041830)
• gensslcert: use hostname when fqdn is too long (bsc#1035829)
• add NotifyAccess=all to service file (bsc#980663)

Robert Święcki discovered that the Apache HTTP Server mod_auth_digest module incorrectly cleared values when processing certain requests. A remote attacker could use this issue to cause the server to crash, resulting in a denial or service, or possibly obtain sensitive information.