Use After Free vulnerability in Apache HTTP Server with modldap in per-directory configuration

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

Users are recommended to upgrade to version 2.4.68, which fixes the issue.

A NULL pointer dereference in moddavlock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.moddavlock is not used internally by moddav or moddavfs.

The only known use-case for moddavlock was moddavsvn from Apache Subversion earlier than version 1.2.0.

Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove moddavlock.

When HTTP/2 was enabled for a http: host or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not the first request on a connection could lead to a misconfiguration and crash. A server that never enabled the h2 protocol or that only enabled it for https: and did not configure the "H2Upgrade on" is unaffected by this.

There is an error in protocol parsing logic of modcluster load balancer Apache HTTP Server modules that allows attacker to cause a Segmentation Fault in the serving httpd process. The vector is modcluster service messages that are used by worker nodes to communicate their status, load and deployed applications to the modcluster balancer. With proper production configuration, the VirtualHost accepting these messages is accessible only from an internal network where worker nodes reside. The error cannot be exploited from the Internet by arbitrary clients.

Upstream bug:

https://issues.jboss.org/browse/JBCS-193

Configuration of modcluster via JVMRoute longer than 80 characters will cause segfault.

A segmentation fault can occur in Apache HTTPD 2.2.

The crash is due to a strcpy buffer overflow in modcluster's modmanager.

https://github.com/modcluster/modcluster/blob/1.2.9.Final/native/modmanager/node.c#L227 [Open URL]

If clients send a request with a JVMRoute longer than 80 characters (the size of the strcpy destination), the strcpy segfaults.

Apache HTTP Server 2.4.16 release fixes the following issue:

) SECURITY: CVE-2015-3185 (cve.mitre.org) Replacement of apsomeauthrequired (unusable in Apache httpd 2.4) with new apsomeauthnrequired and apforceauthn hook. [Ben Reser]

External References:

http://httpd.apache.org/security/vulnerabilities24.html#2.4.16

If an authorization script for LuaAuthzProvider were provided in the configuration multiple times, only the arguments of the last specification were used when invoking the script. This could lead to scripts being invoked with unexpected arguments.

Further details are available in the thread of the original report and bug:

http://www.openwall.com/lists/oss-security/2014/11/28/5

https://issues.apache.org/bugzilla/showbug.cgi?id=57204

Upstream fix:

https://github.com/apache/httpd/commit/3f1693d558d0758f829c8b53993f1749ddf6ffcb

This affects Apache HTTP Server versions 2.3 and later (such as what is shipped in Red Hat Enterprise Linux 7), as modlua is not available in earlier releases. Note that support for LuaAuthzProvider is experimental.

EMC RSA Authentication API before 8.1 SP1, RSA Web Agent before 5.3.5 for Apache Web Server, RSA Web Agent before 5.3.5 for IIS, RSA PAM Agent before 7.0, and RSA Agent before 6.1.4 for Microsoft Windows use an improper encryption algorithm and a weak key for maintaining the stored data of the node secret for the SecurID Authentication API, which allows local users to obtain sensitive information via cryptographic attacks on this data.

Multiple cross-site scripting (XSS) vulnerabilities in the makevariantlist function in modnegotiation.c in the modnegotiation module in the Apache HTTP Server 2.4.x before 2.4.3, when the MultiViews option is enabled, allow remote attackers to inject arbitrary web script or HTML via a crafted filename that is not properly handled during construction of a variant list.

A flaw [1] was found in modlogconfig. If an administrator configured the "%{cookiename}C" log format string to be used, a remote attacker could send a specific cookie which would cause a crash. This crash would only be a denial of service if using a threaded MPM (such as event or worker). Note that Red Hat Enterprise Linux and Fedora use the prefork MPM by default.

This will be fixed upstream [2] in 2.2.22 and affects versions 2.2.17 up to and including 2.2.21.

[1] https://issues.apache.org/bugzilla/showbug.cgi?id=52256 [2] http://svn.apache.org/viewvc?view=revision&revision=1227292

Statement:

Not vulnerable. This issue did not affect the versions of httpd as shipped with Red Hat Enterprise Linux 4, 5, or 6.

It was reported [1] that an integer overflow was found in Apache in the appregsub() function called from mod-setenvif. When a header field is mangled using SetEnvIf, the new environment variable data can be multiples of the size of the submitted header field. This would cause appregsub() to overflow the length value in buffer size calculations, leading to the subsequent allocation call of a too-small buffer. Filling this buffer with user-supplied data will lead to a buffer overflow.

Depending on the input data, this can lead to excessive allocation of server memory (resulting in killed processes due to out-of-memory conditions), invalid memory access when copying large amounts of data (which can lead to a termination of the httpd process), or possibly allowing the execution of arbitrary code.

To trigger this flaw, modsetenvif must be enabled (the default) and the attacker needs to be able to place a crafted .htaccess file on the server (which, in most cases, would require local access to the file system or some web interface that allows for writing arbitrary files to the local file system, such as for custom .htaccess files).

There is currently no upstream fix, however to work around the problem, disable modsetenvif.

[1] http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/

The Apache HTTP Server 2.0.44, when DNS resolution is enabled for client IP addresses, allows remote attackers to inject arbitrary text into log files via an HTTP request in conjunction with a crafted DNS response, as demonstrated by injecting XSS sequences, related to an "Inverse Lookup Log Corruption (ILLC)" issue.

A NULL pointer dereference flaw was discovered in httpd's modproxyftp module. Malicious FTP server can use this flaw to crash httpd's child process via malformed reply to EPSV FTP command.

Problem was confirmed in both 2.0.x and 2.2.x httpd versions.

References: http://www.intevydis.com/blog/?p=59 http://secunia.com/advisories/36549/

A NULL pointer dereference flaw was discovered in httpd's modproxyftp module. Malicious FTP server can use this flaw to crash httpd's child process via malformed reply to EPSV FTP command.

Problem was confirmed in both 2.0.x and 2.2.x httpd versions.

References: http://www.intevydis.com/blog/?p=59 http://secunia.com/advisories/36549/

A flaw was found in the httpd modperl Apache::Status module. If a site has the non default setting of making /perl-status page accessible, remote attackers could use that flaw to trick users or steal sensitive browser data.

The original public announcement can be found here: http://marc.info/?l=apache-modperl&m=123862312808765&w=2

The CVE id mentioned in the above mail is wrong, CVE-2009-0796 is the proper CVE id.

CRLF injection vulnerability in the modnegotiation module in the Apache HTTP Server 2.2.6 and earlier in the 2.2.x series, 2.0.61 and earlier in the 2.0.x series, and 1.3.39 and earlier in the 1.3.x series allows remote authenticated users to inject arbitrary HTTP headers and conduct HTTP response splitting attacks by uploading a file with a multi-line name containing HTTP header sequences and a file extension, which leads to injection within a (1) "406 Not Acceptable" or (2) "300 Multiple Choices" HTTP response when the extension is omitted in a request for the file.

Cross-site scripting (XSS) vulnerability in balancer-manager in modproxybalancer in the Apache HTTP Server 2.2.0 through 2.2.6 allows remote attackers to inject arbitrary web script or HTML via the (1) ss, (2) wr, or (3) rr parameters, or (4) the URL.

suexec in Apache HTTP Server (httpd) 2.2.3 uses a partial comparison for verifying whether the current directory is within the document root, which might allow local users to perform unauthorized operations on incorrect directories, as demonstrated using "htmlbackup" and "htmleditor" under an "html" directory. NOTE: the researcher, who is reliable, claims that the vendor disputes the issue because "the attacks described rely on an insecure server configuration" in which the user "has write access to the document root."

The checkforensic script in apache-utils package 1.3.31 allows local users to overwrite or create arbitrary files via a symlink attack on temporary files.

moddiskcache in Apache 2.0 through 2.0.49 stores client headers, including authentication information, on the hard disk, which could allow local users to gain sensitive information.

A regression error in the Debian distributions of the apache-ssl package (before 1.3.9 on Debian 2.2, and before 1.3.26 on Debian 3.0), for Apache 1.3.27 and earlier, allows local users to read or modify the Apache password file via a symlink attack on temporary files when the administrator runs (1) htpasswd or (2) htdigest, a re-introduction of a vulnerability that was originally identified and addressed by CVE-2001-0131.

modusertrack in Apache 1.3.11 through 1.3.20 generates session ID's using predictable information including host IP address, system time and server process ID, which allows local users to obtain session ID's and bypass authentication when these session ID's are used for authentication.

htpasswd and htdigest in Apache 2.0a9, 1.3.14, and others allows local users to overwrite arbitrary files via a symlink attack.