Interstage HTTP Server/ Interstage HTTP Server 2.2: Security Vulnerabilities(CVE-2011-3607/ CVE-2012-3499/ CVE-2012-2687/ CVE-2013-1862). March 19th, 2015

Notes on using this web page

1. Description

1. A Denial of Service (DoS) vulnerability has been confirmed when the Interstage HTTP Server mod_setenvif module is used.
   This vulnerability is reported as "CVE-2011-3607".
2. A cross-site scripting (XSS) vulnerability has been confirmed if one of the Interstage HTTP Server modules (mod_imap, mod_info, or mod_status) is used in HTTP response data generation processing.
   This vulnerability is reported as "CVE-2012-3499".
3. A cross-site scripting (XSS) vulnerability has been confirmed if the Interstage HTTP Server mod_negotiation module is used in status code 406 error page generation processing.
   This vulnerability is reported as "CVE-2012-2687".
4. A vulnerability where arbitrary commands are executed has been confirmed if the Interstage HTTP Server or Interstage HTTP Server 2.2 mod_rewrite module is used.
   This vulnerability is reported as "CVE-2013-1862".
   
   Unless the following conditions apply, however, Interstage HTTP Server is not affected by this vulnerability problem.
   
   1. "On" was specified for the RewriteEngine directive in the environment definition file (httpd.conf), and
   2. The RewriteLog directive was configured in the environment definition file (httpd.conf), and
   3. A value of 1 or greater was specified for the RewriteLogLevel directive in the environment definition file (httpd.conf).

The security patches shown in 3-2. are provided, and Fujitsu requests that these be applied promptly.
For products for which no security patch is provided, use the workaround shown in 3-3.

2. Impact

1. A modified request sent by a remote attacker may cause the Interstage HTTP Server process to crash, resulting in Denial of Service (DoS).
2. By creating a page that exploits the XSS vulnerability of a website (targeted site) operated by Interstage HTTP Server, a malicious user can execute any code on the computer of a user (victim) who accesses this page.
   Additionally, if the victim has set the targeted site as a trusted site, this code may be executed as code of the trusted site.
   Potentially harmful code includes the following:
   
   • Reading user input
   • Reading/overwriting cookies
   • Forwarding information to a third party
3. Same as "b".
4. By displaying the rewrite log file created based on the modified request sent by the remote attacker on a terminal that has vulnerability related to the escape sequence, any command may be executed using the privileges of that user.

3. Affected systems and corresponding action

3-1. Affected systems:

GP7000F, PRIMEPOWER, PRIMERGY, GP5000, CELSIUS, AT-compatible machine, PRIMEQUEST, SPARC Enterprise, SPARC M10

3-2. Affected products and required patch

For the solution, please refer to the following "3-3. Workaround".

[*a] Affected by CVE-2011-3607: For details, refer to a) of "3-3. Workaround" below.

[*b] Affected by CVE-2012-3499: For details, refer to b) of "3-3. Workaround" below.

[*c1][*c2] Affected by CVE-2012-2687: For details, refer to c) of "3-3. Workaround" below.

[*d] Affected by CVE-2013-1862: For details, refer to d) of "3-3. Workaround" below.

Note: Determining the affected product

To check the software version, refer to the "FUJITSU SOFTWARE RELEASE GUIDE" supplied with the product.

3-3. Workaround

1. None.
   Apply the security patches shown in 3-2.
2. Specify "On" for the UseCanonicalName directive, and then set the web server host name in the ServerName directive, in the environment definition file (httpd.conf).
   After editing this file, restart Interstage HTTP Server.
3. Use one of the methods shown below to edit the environment definition file(httpd.conf), and then set the text message for the error document when status code 406 occurs.
   After editing this file, restart Interstage HTTP Server.
   
   • Product [*c1]
     Specify the text message after double quotation marks (").
     Example) ErrorDocument 406 "406 Not Acceptable
   • Product [*c2]
     Enclose the text message within double quotation marks (").
     Example) ErrorDocument 406 "406 Not Acceptable"
4. When displaying the rewrite log file on the terminal, a terminal that has vulnerability related to the escape sequence should not be used.
   This vulnerability been confirmed on the following terminals:
   
   • Eterm (version 0.9.1 or earlier) [CAN-2003-0021/ CAN-2003-0068]
   • rxvt (2.7.8) [CAN-2003-0022/ CAN-2003-0023/ CAN-2003-0066]
   • XFree86 (versions earlier than 4.3.0) [CAN-2003-0063]
   • VTE (Red Hat Linux 8.0) [CAN-2003-0070]
   • hanterm-xt (version 2.0 or earlier) [CAN-2003-0077]

4. Related information

1. CVE-2011-3607
   Integer overflow in the ap_pregsub 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 mod_setenvif 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.
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3607
2. CVE-2012-3499
   Multiple cross-site scripting (XSS) vulnerabilities in the Apache HTTP Server 2.2.x before 2.2.24-dev and 2.4.x before 2.4.4 allow remote attackers to inject arbitrary web script or HTML via vectors involving hostnames and URIs in the (1) mod_imagemap, (2) mod_info, (3) mod_ldap, (4) mod_proxy_ftp, and (5) mod_status modules.
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-3499
3. CVE-2012-2687
   Multiple cross-site scripting (XSS) vulnerabilities in the make_variant_list function in mod_negotiation.c in the mod_negotiation 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.
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2687
4. CVE-2013-1862
   mod_rewrite.c in the mod_rewrite module in the Apache HTTP Server 2.2.x before 2.2.25 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to execute arbitrary commands via an HTTP request containing an escape sequence for a terminal emulator.
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1862

5. Revision history

• March 19th, 2015: 3rd release
  
  • Change the Patch ID in "3-2. Affected products and required patch".
• March 20th, 2014: 2nd release
  
  • Change the Patch ID in "3-2. Affected products and required patch".
  • Change the Target OS in "3-2. Affected products and required patch".
• November 26th, 2013: Initial release