Updated httpd packages that fix multiple security issues are now available for Red Hat Enterprise Linux 3 and 5.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

The Apache HTTP Server is a popular Web server.

A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure Sockets Layer) protocols handle session renegotiation.
A man-in-the-middle attacker could use this flaw to prefix arbitrary plain text to a client's session (for example, an HTTPS connection to a website). This could force the server to process an attacker's request as if authenticated using the victim's credentials. This update partially mitigates this flaw for SSL sessions to HTTP servers using mod_ssl by rejecting client-requested renegotiation.
(CVE-2009-3555)

Note: This update does not fully resolve the issue for HTTPS servers.
An attack is still possible in configurations that require a server-initiated renegotiation. Refer to the following Knowledgebase article for further information:
http://kbase.redhat.com/faq/docs/DOC-20491

A NULL pointer dereference flaw was found in the Apache mod_proxy_ftp module. A malicious FTP server to which requests are being proxied could use this flaw to crash an httpd child process via a malformed reply to the EPSV or PASV commands, resulting in a limited denial of service. (CVE-2009-3094)

A second flaw was found in the Apache mod_proxy_ftp module. In a reverse proxy configuration, a remote attacker could use this flaw to bypass intended access restrictions by creating a carefully-crafted HTTP Authorization header, allowing the attacker to send arbitrary commands to the FTP server. (CVE-2009-3095)

All httpd users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the httpd daemon must be restarted for the update to take effect.

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2009:1580 advisory.

    The Apache HTTP Server is a popular Web server.

    A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure     Sockets Layer) protocols handle session renegotiation. A man-in-the-middle     attacker could use this flaw to prefix arbitrary plain text to a client's     session (for example, an HTTPS connection to a website). This could force     the server to process an attacker's request as if authenticated using the     victim's credentials. This update partially mitigates this flaw for SSL     sessions to HTTP servers using mod_ssl by rejecting client-requested     renegotiation. (CVE-2009-3555)

    Note: This update does not fully resolve the issue for HTTPS servers. An     attack is still possible in configurations that require a server-initiated     renegotiation. Refer to the following Knowledgebase article for further     information: http://kbase.redhat.com/faq/docs/DOC-20491

    A denial of service flaw was found in the Apache mod_deflate module. This     module continued to compress large files until compression was complete,     even if the network connection that requested the content was closed before     compression completed. This would cause mod_deflate to consume large     amounts of CPU if mod_deflate was enabled for a large file. (CVE-2009-1891)

    A NULL pointer dereference flaw was found in the Apache mod_proxy_ftp     module. A malicious FTP server to which requests are being proxied could     use this flaw to crash an httpd child process via a malformed reply to the     EPSV or PASV commands, resulting in a limited denial of service.
    (CVE-2009-3094)

    A second flaw was found in the Apache mod_proxy_ftp module. In a reverse     proxy configuration, a remote attacker could use this flaw to bypass     intended access restrictions by creating a carefully-crafted HTTP     Authorization header, allowing the attacker to send arbitrary commands to     the FTP server. (CVE-2009-3095)

    All httpd users should upgrade to these updated packages, which contain     backported patches to correct these issues. After installing the updated     packages, the httpd daemon must be restarted for the update to take effect.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Marsh Ray and Steve Dispensa discovered a flaw in the TLS and SSLv3 protocols. If an attacker could perform a man in the middle attack at the start of a TLS connection, the attacker could inject arbitrary content at the beginning of the user's session. The flaw is with TLS renegotiation and potentially affects any software that supports this feature. Attacks against the HTTPS protocol are known, with the severity of the issue depending on the safeguards used in the web application. Until the TLS protocol and underlying libraries are adjusted to defend against this vulnerability, a partial, temporary workaround has been applied to Apache that disables client initiated TLS renegotiation. This update does not protect against server initiated TLS renegotiation when using SSLVerifyClient and SSLCipherSuite on a per Directory or Location basis. Users can defend againt server inititiated TLS renegotiation attacks by adjusting their Apache configuration to use SSLVerifyClient and SSLCipherSuite only on the server or virtual host level. (CVE-2009-3555)

It was discovered that mod_proxy_ftp in Apache did not properly sanitize its input when processing replies to EPASV and PASV commands.
An attacker could use this to cause a denial of service in the Apache child process. (CVE-2009-3094)

Another flaw was discovered in mod_proxy_ftp. If Apache is configured as a reverse proxy, an attacker could send a crafted HTTP header to bypass intended access controls and send arbitrary commands to the FTP server. (CVE-2009-3095).

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

This update contains the latest stable release of Apache httpd. Three security fixes are included, along with several minor bug fixes. A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure Sockets Layer) protocols handle session renegotiation. A man-in-the-middle attacker could use this flaw to prefix arbitrary plain text to a client's session (for example, an HTTPS connection to a website). This could force the server to process an attacker's request as if authenticated using the victim's credentials. This update partially mitigates this flaw for SSL sessions to HTTP servers using mod_ssl by rejecting client-requested renegotiation.
(CVE-2009-3555) Note: This update does not fully resolve the issue for HTTPS servers. An attack is still possible in configurations that require a server-initiated renegotiation A NULL pointer dereference flaw was found in the Apache mod_proxy_ftp module. A malicious FTP server to which requests are being proxied could use this flaw to crash an httpd child process via a malformed reply to the EPSV or PASV commands, resulting in a limited denial of service. (CVE-2009-3094) A second flaw was found in the Apache mod_proxy_ftp module. In a reverse proxy configuration, a remote attacker could use this flaw to bypass intended access restrictions by creating a carefully-crafted HTTP Authorization header, allowing the attacker to send arbitrary commands to the FTP server. (CVE-2009-3095) See the upstream changes file for further information: http://www.apache.org/dist/httpd/CHANGES_2.2.14

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

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2010:0011 advisory.

  - httpd: NULL pointer defer in mod_proxy_ftp caused by crafted EPSV and PASV reply (CVE-2009-3094)

  - httpd: mod_proxy_ftp FTP command injection via Authorization HTTP header (CVE-2009-3095)

  - TLS: MITM attacks via session renegotiation (CVE-2009-3555)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Multiple vulnerabilities has been found and corrected in apache :

Memory leak in the zlib_stateful_init function in crypto/comp/c_zlib.c in libssl in OpenSSL 0.9.8f through 0.9.8h allows remote attackers to cause a denial of service (memory consumption) via multiple calls, as demonstrated by initial SSL client handshakes to the Apache HTTP Server mod_ssl that specify a compression algorithm (CVE-2008-1678).
Note that this security issue does not really apply as zlib compression is not enabled in the openssl build provided by Mandriva, but apache is patched to address this issue anyway (conserns 2008.1 only).

mod_proxy_ajp.c in the mod_proxy_ajp module in the Apache HTTP Server 2.2.11 allows remote attackers to obtain sensitive response data, intended for a client that sent an earlier POST request with no request body, via an HTTP request (CVE-2009-1191).

Cross-site scripting (XSS) vulnerability in proxy_ftp.c in the mod_proxy_ftp module in Apache 2.0.63 and earlier, and mod_proxy_ftp.c in the mod_proxy_ftp module in Apache 2.2.9 and earlier 2.2 versions, allows remote attackers to inject arbitrary web script or HTML via wildcards in a pathname in an FTP URI (CVE-2008-2939). Note that this security issue was initially addressed with MDVSA-2008:195 but the patch fixing the issue was added but not applied in 2009.0.

The Apache HTTP Server 2.2.11 and earlier 2.2 versions does not properly handle Options=IncludesNOEXEC in the AllowOverride directive, which allows local users to gain privileges by configuring (1) Options Includes, (2) Options +Includes, or (3) Options +IncludesNOEXEC in a .htaccess file, and then inserting an exec element in a .shtml file (CVE-2009-1195).

The stream_reqbody_cl function in mod_proxy_http.c in the mod_proxy module in the Apache HTTP Server before 2.3.3, when a reverse proxy is configured, does not properly handle an amount of streamed data that exceeds the Content-Length value, which allows remote attackers to cause a denial of service (CPU consumption) via crafted requests (CVE-2009-1890).

Fix a potential Denial-of-Service attack against mod_deflate or other modules, by forcing the server to consume CPU time in compressing a large file after a client disconnects (CVE-2009-1891).

The ap_proxy_ftp_handler function in modules/proxy/proxy_ftp.c in the mod_proxy_ftp module in the Apache HTTP Server 2.0.63 and 2.2.13 allows remote FTP servers to cause a denial of service (NULL pointer dereference and child process crash) via a malformed reply to an EPSV command (CVE-2009-3094).

The mod_proxy_ftp module in the Apache HTTP Server allows remote attackers to bypass intended access restrictions and send arbitrary commands to an FTP server via vectors related to the embedding of these commands in the Authorization HTTP header, as demonstrated by a certain module in VulnDisco Pack Professional 8.11. NOTE: as of 20090903, this disclosure has no actionable information. However, because the VulnDisco Pack author is a reliable researcher, the issue is being assigned a CVE identifier for tracking purposes (CVE-2009-3095).

Apache is affected by SSL injection or man-in-the-middle attacks due to a design flaw in the SSL and/or TLS protocols. A short term solution was released Sat Nov 07 2009 by the ASF team to mitigate these problems. Apache will now reject in-session renegotiation (CVE-2009-3555).

Packages for 2008.0 are provided for Corporate Desktop 2008.0 customers

This update provides a solution to these vulnerabilities.

A design flaw has been found in the TLS and SSL protocol that allows an attacker to inject arbitrary content at the beginning of a TLS/SSL connection. The attack is related to the way how TLS and SSL handle session renegotiations. CVE-2009-3555 has been assigned to this vulnerability.

As a partial mitigation against this attack, this apache2 update disables client-initiated renegotiations. This should fix the vulnerability for the majority of Apache configurations in use.

NOTE: This is not a complete fix for the problem. The attack is still possible in configurations where the server initiates the renegotiation. This is the case for the following configurations (the information in the changelog of the updated packages is slightly inaccurate) :

  - The 'SSLVerifyClient' directive is used in a Directory     or Location context.
  - The 'SSLCipherSuite' directive is used in a Directory or     Location context.

As a workaround, you may rearrange your configuration in a way that SSLVerifyClient and SSLCipherSuite are only used on the server or virtual host level.


A complete fix for the problem will require a protocol change. Further information will be included in a separate announcement about this issue.

In addition, this update fixes the following issues in Apache's mod_proxy_ftp :

  - CVE-2009-3094     Insufficient input validation in the mod_proxy_ftp     module allowed remote FTP servers to cause a denial of     service (NULL pointer dereference and child process     crash) via a malformed reply to an EPSV command.

  - CVE-2009-3095     Insufficient input validation in the mod_proxy_ftp     module allowed remote authenticated attackers to bypass     intended access restrictions and send arbitrary FTP     commands to an FTP server.

This update of the Apache webserver fixes various security issues :

  - the option IncludesNOEXEC could be bypassed via     .htaccess. (CVE-2009-1195)

  - mod_proxy could run into an infinite loop when used as     reverse proxy. (CVE-2009-1890)

  - mod_deflate continued to compress large files even after     a network connection was closed, causing mod_deflate to     consume large amounts of CPU. (CVE-2009-1891)

  - The ap_proxy_ftp_handler function in     modules/proxy/proxy_ftp.c in the mod_proxy_ftp module     allows remote FTP servers to cause a denial of service     (NULL pointer dereference and child process crash) via a     malformed reply to an EPSV command. (CVE-2009-3094)

  - access restriction bypass in mod_proxy_ftp module.
    (CVE-2009-3095)

Also a incompatibility between mod_cache and mod_rewrite was fixed.

ID	Name	Product	Family	Published	Updated	Severity
42469	RHEL 3 / 5 : httpd (RHSA-2009:1579)	Nessus	Red Hat Local Security Checks	11/12/2009	1/14/2021	high
42470	RHEL 4 : httpd (RHSA-2009:1580)	Nessus	Red Hat Local Security Checks	11/12/2009	11/4/2024	critical
42858	Ubuntu 6.06 LTS / 8.04 LTS / 8.10 / 9.04 / 9.10 : apache2 vulnerabilities (USN-860-1)	Nessus	Ubuntu Local Security Checks	11/19/2009	1/19/2021	high
43090	Fedora 10 : httpd-2.2.14-1.fc10 (2009-12604)	Nessus	Fedora Local Security Checks	12/10/2009	1/11/2021	high
193673	RHEL 5 : httpd and httpd22 (RHSA-2010:0011)	Nessus	Red Hat Local Security Checks	4/21/2024	4/21/2024	critical
43042	Mandriva Linux Security Advisory : apache (MDVSA-2009:323)	Nessus	Mandriva Local Security Checks	12/8/2009	1/6/2021	high
44799	Debian DSA-1934-1 : apache2 - multiple issues	Nessus	Debian Local Security Checks	2/24/2010	1/4/2021	high
49826	SuSE 10 Security Update : Apache 2 (ZYPP Patch Number 6572)	Nessus	SuSE Local Security Checks	10/11/2010	1/14/2021	high
67073	CentOS 3 / 5 : httpd (CESA-2009:1579)	Nessus	CentOS Local Security Checks	6/29/2013	1/4/2021	high

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