Security fix for CVE-2016-8743, CVE-2016-2161, CVE-2016-0736

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for apache2 provides the following fixes :

Security issues fixed :

  - CVE-2016-0736: Protect mod_session_crypto data with a     MAC to prevent padding oracle attacks (bsc#1016712).

  - CVE-2016-2161: Malicious input to mod_auth_digest could     have caused the server to crash, resulting in DoS     (bsc#1016714).

  - CVE-2016-8743: Added new directive 'HttpProtocolOptions     Strict' to avoid proxy chain misinterpretation     (bsc#1016715).

Bugfixes :

  - Add NotifyAccess=all to systemd service files to prevent     warnings in the log when using mod_systemd (bsc#980663).

This update was imported from the SUSE:SLE-12-SP1:Update update project.

An update is now available for Red Hat JBoss Core Services on RHEL 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Red Hat JBoss Core Services is a set of supplementary software for Red Hat JBoss middleware products. This software, such as Apache HTTP Server, is common to multiple JBoss middleware products, and is packaged under Red Hat JBoss Core Services to allow for faster distribution of updates, and for a more consistent update experience.

This release of Red Hat JBoss Core Services Apache HTTP Server 2.4.23 Service Pack 1 serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.23, and includes bug fixes, which are documented in the Release Notes document linked to in the References.

Security Fix(es) :

* A memory leak flaw was found in the way OpenSSL handled TLS status request extension data during session renegotiation. A remote attacker could cause a TLS server using OpenSSL to consume an excessive amount of memory and, possibly, exit unexpectedly after exhausting all available memory, if it enabled OCSP stapling support. (CVE-2016-6304)

* It was discovered that the mod_session_crypto module of httpd did not use any mechanisms to verify integrity of the encrypted session data stored in the user's browser. A remote attacker could use this flaw to decrypt and modify session data using a padding oracle attack.
(CVE-2016-0736)

* It was discovered that the mod_auth_digest module of httpd did not properly check for memory allocation failures. A remote attacker could use this flaw to cause httpd child processes to repeatedly crash if the server used HTTP digest authentication. (CVE-2016-2161)

* A timing attack flaw was found in OpenSSL that could allow a malicious user with local access to recover ECDSA P-256 private keys.
(CVE-2016-7056)

* A denial of service flaw was found in the way the TLS/SSL protocol defined processing of ALERT packets during a connection handshake. A remote attacker could use this flaw to make a TLS/SSL server consume an excessive amount of CPU and fail to accept connections from other clients. (CVE-2016-8610)

* It was discovered that the HTTP parser in httpd incorrectly allowed certain characters not permitted by the HTTP protocol specification to appear unencoded in HTTP request headers. If httpd was used in conjunction with a proxy or backend server that interpreted those characters differently, a remote attacker could possibly use this flaw to inject data into HTTP responses, resulting in proxy cache poisoning. (CVE-2016-8743)

* A vulnerability was found in httpd's handling of the LimitRequestFields directive in mod_http2, affecting servers with HTTP/2 enabled. An attacker could send crafted requests with headers larger than the server's available memory, causing httpd to crash.
(CVE-2016-8740)

Red Hat would like to thank the OpenSSL project for reporting CVE-2016-6304 and Shi Lei (Gear Team of Qihoo 360 Inc.) for reporting CVE-2016-8610. Upstream acknowledges Shi Lei (Gear Team of Qihoo 360 Inc.) as the original reporter of CVE-2016-6304.

According to the versions of the httpd packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - The log_cookie function in mod_log_config.c in the     mod_log_config module in the Apache HTTP Server before     2.4.8 allows remote attackers to cause a denial of     service (segmentation fault and daemon crash) via a     crafted cookie that is not properly handled during     truncation.(CVE-2014-0098)

  - A race condition flaw, leading to heap-based buffer     overflows, was found in the mod_status httpd module. A     remote attacker able to access a status page served by     mod_status on a server using a threaded     Multi-Processing Module (MPM) could send a specially     crafted request that would cause the httpd child     process to crash or, possibly, allow the attacker to     execute arbitrary code with the privileges of the     'apache' user.(CVE-2014-0226)

  - It was discovered that the HTTP parser in httpd     incorrectly allowed certain characters not permitted by     the HTTP protocol specification to appear unencoded in     HTTP request headers. If httpd was used in conjunction     with a proxy or backend server that interpreted those     characters differently, a remote attacker could     possibly use this flaw to inject data into HTTP     responses, resulting in proxy cache     poisoning.(CVE-2016-8743)

  - A NULL pointer dereference flaw was found in the way     the mod_cache httpd module handled Content-Type     headers. A malicious HTTP server could cause the httpd     child process to crash when the Apache HTTP server was     configured to proxy to a server with caching     enabled.(CVE-2014-3581)

  - Multiple flaws were found in the way httpd parsed HTTP     requests and responses using chunked transfer encoding.
    A remote attacker could use these flaws to create a     specially crafted request, which httpd would decode     differently from an HTTP proxy software in front of it,     possibly leading to HTTP request smuggling     attacks.(CVE-2015-3183)

  - In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and     2.4.0 to 2.4.29, mod_authnz_ldap, if configured with     AuthLDAPCharsetConfig, uses the Accept-Language header     value to lookup the right charset encoding when     verifying the user's credentials. If the header value     is not present in the charset conversion table, a     fallback mechanism is used to truncate it to a two     characters value to allow a quick retry (for example,     'en-US' is truncated to 'en'). A header value of less     than two characters forces an out of bound write of one     NUL byte to a memory location that is not part of the     string. In the worst case, quite unlikely, the process     would crash which could be used as a Denial of Service     attack. In the more likely case, this memory is already     reserved for future use and the issue has no effect at     all.(CVE-2017-15710)

  - A NULL pointer dereference flaw was found in the     httpd's mod_ssl module. A remote attacker could use     this flaw to cause an httpd child process to crash if     another module used by httpd called a certain API     function during the processing of an HTTPS     request.(CVE-2017-3169)

  - It was discovered that httpd used the value of the     Proxy header from HTTP requests to initialize the     HTTP_PROXY environment variable for CGI scripts, which     in turn was incorrectly used by certain HTTP client     implementations to configure the proxy for outgoing     HTTP requests. A remote attacker could possibly use     this flaw to redirect HTTP requests performed by a CGI     script to an attacker-controlled proxy via a malicious     HTTP request.(CVE-2016-5387)

  - A buffer over-read flaw was found in the httpd's     mod_mime module. A user permitted to modify httpd's     MIME configuration could use this flaw to cause httpd     child process to crash.(CVE-2017-7679)

  - A specially crafted HTTP request header could have     crashed the Apache HTTP Server prior to version 2.4.30     due to an out of bound read while preparing data to be     cached in shared memory. It could be used as a Denial     of Service attack against users of mod_cache_socache.
    The vulnerability is considered as low risk since     mod_cache_socache is not widely used, mod_cache_disk is     not concerned by this vulnerability.(CVE-2018-1303)

  - It was discovered that the httpd's mod_auth_digest     module did not properly initialize memory before using     it when processing certain headers related to digest     authentication. A remote attacker could possibly use     this flaw to disclose potentially sensitive information     or cause httpd child process to crash by sending     specially crafted requests to a server.(CVE-2017-9788)

  - A flaw was found in the way httpd handled HTTP Trailer     headers when processing requests using chunked     encoding. A malicious client could use Trailer headers     to set additional HTTP headers after header processing     was performed by other modules. This could, for     example, lead to a bypass of header restrictions     defined with mod_headers.(CVE-2013-5704)

  - A buffer over-read flaw was found in the httpd's     ap_find_token() function. A remote attacker could use     this flaw to cause httpd child process to crash via a     specially crafted HTTP request.(CVE-2017-7668)

  - A race condition was found in mod_auth_digest when the     web server was running in a threaded MPM configuration.
    It could allow a user with valid credentials to     authenticate using another username, bypassing     configured access control restrictions.(CVE-2019-0217)

  - A NULL pointer dereference flaw was found in the     mod_cache httpd module. A malicious HTTP server could     cause the httpd child process to crash when the Apache     HTTP Server was used as a forward proxy with caching.
    (CVE-2013-4352)

  - he dav_xml_get_cdata function in main/util.c in the     mod_dav module in the Apache HTTP Server before 2.4.8     does not properly remove whitespace characters from     CDATA sections, which allows remote attackers to cause     a denial of service (daemon crash) via a crafted DAV     WRITE request. (CVE-2013-6438)

  - A denial of service flaw was found in the mod_proxy     httpd module. A remote attacker could send a specially     crafted request to a server configured as a reverse     proxy using a threaded Multi-Processing Modules (MPM)     that would cause the httpd child process to crash.
    (CVE-2014-0117)

  - A denial of service flaw was found in the way httpd's     mod_deflate module handled request body decompression     (configured via the 'DEFLATE' input filter). A remote     attacker able to send a request whose body would be     decompressed could use this flaw to consume an     excessive amount of system memory and CPU on the target     system.(CVE-2014-0118)

  - A denial of service flaw was found in the way httpd's     mod_cgid module executed CGI scripts that did not read     data from the standard input. A remote attacker could     submit a specially crafted request that would cause the     httpd child process to hang     indefinitely.(CVE-2014-0231)

  - It was discovered that in httpd 2.4, the internal API     function ap_some_auth_required() could incorrectly     indicate that a request was authenticated even when no     authentication was used. An httpd module using this API     function could consequently allow access that should     have been denied. (CVE-2015-3185)

  - It was discovered that the mod_session_crypto module of     httpd did not use any mechanisms to verify integrity of     the encrypted session data stored in the user's     browser. A remote attacker could use this flaw to     decrypt and modify session data using a padding oracle     attack. (CVE-2016-0736)

  - It was discovered that the mod_auth_digest module of     httpd did not properly check for memory allocation     failures. A remote attacker could use this flaw to     cause httpd child processes to repeatedly crash if the     server used HTTP digest authentication.(CVE-2016-2161)

  - It was discovered that the use of httpd's     ap_get_basic_auth_pw() API function outside of the     authentication phase could lead to authentication     bypass. A remote attacker could possibly use this flaw     to bypass required authentication if the API was used     incorrectly by one of the modules used by     httpd.(CVE-2017-3167)

  - A use-after-free flaw was found in the way httpd     handled invalid and previously unregistered HTTP     methods specified in the Limit directive used in an     .htaccess file. A remote attacker could possibly use     this flaw to disclose portions of the server memory, or     cause httpd child process to crash. (CVE-2017-9798)

  - In Apache httpd 2.2.0 to 2.4.29, when generating an     HTTP Digest authentication challenge, the nonce sent to     prevent reply attacks was not correctly generated using     a pseudo-random seed. In a cluster of servers using a     common Digest authentication configuration, HTTP     requests could be replayed across servers by an     attacker without detection. (CVE-2018-1312)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for httpd is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es) :

* It was discovered that the mod_session_crypto module of httpd did not use any mechanisms to verify integrity of the encrypted session data stored in the user's browser. A remote attacker could use this flaw to decrypt and modify session data using a padding oracle attack.
(CVE-2016-0736)

* It was discovered that the mod_auth_digest module of httpd did not properly check for memory allocation failures. A remote attacker could use this flaw to cause httpd child processes to repeatedly crash if the server used HTTP digest authentication. (CVE-2016-2161)

* It was discovered that the HTTP parser in httpd incorrectly allowed certain characters not permitted by the HTTP protocol specification to appear unencoded in HTTP request headers. If httpd was used in conjunction with a proxy or backend server that interpreted those characters differently, a remote attacker could possibly use this flaw to inject data into HTTP responses, resulting in proxy cache poisoning. (CVE-2016-8743)

Note: The fix for the CVE-2016-8743 issue causes httpd to return '400 Bad Request' error to HTTP clients which do not strictly follow HTTP protocol specification. A newly introduced configuration directive 'HttpProtocolOptions Unsafe' can be used to re-enable the old less strict parsing. However, such setting also re-introduces the CVE-2016-8743 issue.

Bug Fix(es) :

* When waking up child processes during a graceful restart, the httpd parent process could attempt to open more connections than necessary if a large number of child processes had been active prior to the restart. Consequently, a graceful restart could take a long time to complete. With this update, httpd has been fixed to limit the number of connections opened during a graceful restart to the number of active children, and the described problem no longer occurs.
(BZ#1420002)

* Previously, httpd running in a container returned the 500 HTTP status code (Internal Server Error) when a connection to a WebSocket server was closed. As a consequence, the httpd server failed to deliver the correct HTTP status and data to a client. With this update, httpd correctly handles all proxied requests to the WebSocket server, and the described problem no longer occurs. (BZ#1429947)

* In a configuration using LDAP authentication with the mod_authnz_ldap module, the name set using the AuthLDAPBindDN directive was not correctly used to bind to the LDAP server for all queries. Consequently, authorization attempts failed. The LDAP modules have been fixed to ensure the configured name is correctly bound for LDAP queries, and authorization using LDAP no longer fails.
(BZ#1420047)

ID	名稱	產品	系列	已發布	已更新	嚴重性
96114	Fedora 24 : httpd (2016-d22f50d985)	Nessus	Fedora Local Security Checks	2016/12/27	2026/1/7	high
99155	openSUSE Security Update : apache2 (openSUSE-2017-417)	Nessus	SuSE Local Security Checks	2017/4/3	2025/12/26	high
117315	RHEL 7 : JBoss Core Services (RHSA-2017:1413)	Nessus	Red Hat Local Security Checks	2018/9/6	2024/8/12	high
124922	EulerOS Virtualization 3.0.1.0 : httpd (EulerOS-SA-2019-1419)	Nessus	Huawei Local Security Checks	2019/5/14	2024/5/23	critical
99340	RHEL 7 : httpd (RHSA-2017:0906)	Nessus	Red Hat Local Security Checks	2017/4/13	2025/12/25	high

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