Additional problems were discovered in the httpd fix for CVE-2011-3368 - a reverse proxy bypass flaw - tracked via bug #740045. Upstream mailing list post identifies following request forms, which are not handled correctly:
GET @localhost::8880 HTTP/1.0\r\n\r\n GET qualys:@qqq.qq.qualys.com HTTP/1.0\r\n\r\n
Reference: http://thread.gmane.org/gmane.comp.apache.devel/46440
SUSE reported that upstream patch for CVE-2011-3368 (bug #740045), when applied to httpd versions before 2.2.18, does not completely address the issue, when attacker sends HTTP 0.9 requests::
https://bugzilla.novell.com/showbug.cgi?id=722545#c15 http://thread.gmane.org/gmane.comp.apache.devel/45978 http://thread.gmane.org/gmane.comp.security.oss.general/6102
The fix has been created upstream and committed to trunk:
http://thread.gmane.org/gmane.comp.apache.devel/45978/focus=45979 http://svn.apache.org/viewvc?view=revision&revision=1188745
Upstream also confirmed this additional fix is not required for httpd versions 2.2.18 and later:
http://thread.gmane.org/gmane.comp.apache.devel/45978/focus=45983 http://thread.gmane.org/gmane.comp.apache.devel/45978/focus=45985
Integer overflow in the appregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the modsetenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer overflow.
RMDG partner and independent security consultancy, "Context Information Security" has made CPNI Response aware of a security vulnerability which could potentially allow an attacker to gain full internal access to a network from the internet.
The technique exploits insecurely configured reverse web proxies to gain access to internal/DMZ systems.
This attack is based on an Apache web server which is using "modrewrite" to proxy web requests internally. Other proxies may suffer from this issue.
The vulnerability occurs if the Apache configuration file is configured like this:
RewriteRule ^(.) http://internalserver:80$1 [P]
As opposed to:
RewriteRule ^(.) http://internalserver:80/$1 [P]
It is important for readers to review their reverse proxy configurations to ensure that the rewrite rules are securely configured and cannot be abused in such a way that they can be used to compromise internal systems.
Cross-site scripting (XSS) vulnerability in Apache 2.2.6 and earlier allows remote attackers to inject arbitrary web script or HTML via UTF-7 encoded URLs that are not properly handled when displaying the 403 Forbidden error page.
Cross-site scripting (XSS) vulnerability in modstatus in the Apache HTTP Server 2.2.0 through 2.2.6, 2.0.35 through 2.0.61, and 1.3.2 through 1.3.39, when the server-status page is enabled, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
Cross-site scripting (XSS) vulnerability in modautoindex.c in the Apache HTTP Server before 2.2.6, when the charset on a server-generated page is not defined, allows remote attackers to inject arbitrary web script or HTML via the P parameter using the UTF-7 charset. NOTE: it could be argued that this issue is due to a design limitation of browsers that attempt to perform automatic content type detection.
Format string vulnerability in the modtcl module 1.0 for Apache 2.x allows context-dependent attackers to execute arbitrary code via format string specifiers that are not properly handled in a setvar function call in (1) tclcmds.c and (2) tclcore.c.
modssl in Apache 2.0 up to 2.0.55, when configured with an SSL vhost with access control and a custom error 400 error page, allows remote attackers to cause a denial of service (application crash) via a non-SSL request to an SSL port, which triggers a NULL pointer dereference.
Cross-site scripting (XSS) vulnerability in the modimap module of Apache httpd before 1.3.35-dev and Apache httpd 2.0.x before 2.0.56-dev allows remote attackers to inject arbitrary web script or HTML via the Referer when using image maps.
The byte-range filter in Apache 2.0 before 2.0.54 allows remote attackers to cause a denial of service (memory consumption) via an HTTP header with a large Range field.
PHP 4.3.4 and earlier in Apache 1.x and 2.x (modphp) can leak global variables between virtual hosts that are handled by the same Apache child process but have different settings, which could allow remote attackers to obtain sensitive information.
Memory leak in sslengineio.c for modssl in Apache 2 before 2.0.49 allows remote attackers to cause a denial of service (memory consumption) via plain HTTP requests to the SSL port of an SSL-enabled server.
DISPUTED The modphp module for the Apache HTTP Server allows local users with write access to PHP scripts to send signals to the server's process group and use the server's file descriptors, as demonstrated by sending a STOP signal, then intercepting incoming connections on the server's TCP port. NOTE: the PHP developer has disputed this vulnerability, saying "The opened file descriptors are opened by Apache. It is the job of Apache to protect them ... Not a bug in PHP."
Apache 2 before 2.0.47, and certain versions of modssl for Apache 1.3, do not properly handle "certain sequences of per-directory renegotiations and the SSLCipherSuite directive being used to upgrade from a weak ciphersuite to a strong one," which could cause Apache to use the weak ciphersuite.
The prefork MPM in Apache 2 before 2.0.47 does not properly handle certain errors from accept, which could lead to a denial of service.
Apache 2 before 2.0.47, when running on an IPv6 host, allows attackers to cause a denial of service (CPU consumption by infinite loop) when the FTP proxy server fails to create an IPv6 socket.
Vulnerability in the aprpsprintf function in the Apache Portable Runtime (APR) library for Apache 2.0.37 through 2.0.45 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via long strings, as demonstrated using XML objects to moddav, and possibly other vectors.
The authentication module for Apache 2.0.40 through 2.0.45 on Unix does not properly handle threads safely when using the cryptr or crypt functions, which allows remote attackers to cause a denial of service (failed Basic authentication with valid usernames and passwords) when a threaded MPM is used.
Unknown vulnerability in filestat.c for Apache running on OS2, versions 2.0 through 2.0.45, allows unknown attackers to cause a denial of service via requests related to device names.