The shared memory scoreboard in the HTTP daemon for Apache 1.3.x before 1.3.27 allows any user running as the Apache UID to send a SIGUSR1 signal to any process as root, resulting in a denial of service (process kill) or possibly other behaviors that would not normally be allowed, by modifying the parent[].pid and parent[].last_rtime segments in the scoreboard.

s700_800 11.04 Virtualvault 4.5 IWS Update : 

Potential vulnerability regarding ownership permissions of System V shared memory based scoreboards. (CERT VU#825353, CVE CAN-2002-0839) Potential cross-site scripting vulnerability in the default error page when using wildcard DNS. (CERT VU#240329, CVE CAN-2002-0840) Potential overflows in ab.c which could be exploited by a malicious server.
(CERT VU#858881, CVE CAN-2002-0843) Exposure of CGI source when a POST request is sent to a location where both DAV and CGI are enabled.
(CERT VU#91071, CVE CAN-2002-1156).

s700_800 11.04 Virtualvault 4.6 OWS update : 

Potential vulnerability regarding ownership permissions of System V shared memory based scoreboards. (CERT VU#825353, CVE CAN-2002-0839) Potential cross-site scripting vulnerability in the default error page when using wildcard DNS. (CERT VU#240329, CVE CAN-2002-0840) Potential overflows in ab.c which could be exploited by a malicious server.
(CERT VU#858881, CVE CAN-2002-0843) Exposure of CGI source when a POST request is sent to a location where both DAV and CGI are enabled.
(CERT VU#91071, CVE CAN-2002-1156).

s700_800 11.04 Virtualvault 4.5 OWS update : 

Potential vulnerability regarding ownership permissions of System V shared memory based scoreboards. (CERT VU#825353, CVE CAN-2002-0839) Potential cross-site scripting vulnerability in the default error page when using wildcard DNS. (CERT VU#240329, CVE CAN-2002-0840) Potential overflows in ab.c which could be exploited by a malicious server.
(CERT VU#858881, CVE CAN-2002-0843) Exposure of CGI source when a POST request is sent to a location where both DAV and CGI are enabled.
(CERT VU#91071, CVE CAN-2002-1156).

s700_800 11.04 Virtualvault 4.6 IWS update. : 

Potential vulnerability regarding ownership permissions of System V shared memory based scoreboards. (CERT VU#825353, CVE CAN-2002-0839) Potential cross-site scripting vulnerability in the default error page when using wildcard DNS. (CERT VU#240329, CVE CAN-2002-0840) Potential overflows in ab.c which could be exploited by a malicious server.
(CERT VU#858881, CVE CAN-2002-0843) Exposure of CGI source when a POST request is sent to a location where both DAV and CGI are enabled.
(CERT VU#91071, CVE CAN-2002-1156).

s700_800 11.X OV NNM6.2 Intermediate Patch, Feb 2003 : 

Potential vulnerability regarding ownership permissions of System V shared memory based scoreboards. (CERT VU#825353, CVE CAN-2002-0839) Potential cross-site scripting vulnerability in the default error page when using wildcard DNS. (CERT VU#240329, CVE CAN-2002-0840) Potential overflows in ab.c which could be exploited by a malicious server.
(CERT VU#858881, CVE CAN-2002-0843) Exposure of CGI source when a POST request is sent to a location where both DAV and CGI are enabled.
(CERT VU#91071, CVE CAN-2002-1156).

According to David Wagner, iDEFENSE and the Apache HTTP Server Project, several vulnerabilities have been found in the Apache server package, a commonly used webserver. Most of the code is shared between the Apache and Apache-Perl packages, so vulnerabilities are shared as well.

These vulnerabilities could allow an attacker to enact a denial of service against a server or execute a cross site scripting attack, or steal cookies from other website users. The Common Vulnerabilities and Exposures (CVE) project identified the following vulnerabilities :

  - CAN-2002-0839: A vulnerability exists on platforms using     System V shared memory based scoreboards. This     vulnerability allows an attacker to execute code under     the Apache UID to exploit the Apache shared memory     scoreboard format and send a signal to any process as     root or cause a local denial of service attack.
  - CAN-2002-0840: Apache is susceptible to a cross site     scripting vulnerability in the default 404 page of any     web server hosted on a domain that allows wildcard DNS     lookups.

  - CAN-2002-0843: There were some possible overflows in the     utility ApacheBench (ab) which could be exploited by a     malicious server. No such binary programs are     distributed by the Apache-Perl package, though.

  - CAN-2002-1233: A race condition in the htpasswd and     htdigest program enables a malicious local user to read     or even modify the contents of a password file or easily     create and overwrite files as the user running the     htpasswd (or htdigest respectively) program. No such     binary programs are distributed by the Apache-Perl     package, though.

  - CAN-2001-0131: htpasswd and htdigest in Apache 2.0a9,     1.3.14, and others allows local users to overwrite     arbitrary files via a symlink attack. No such binary     programs are distributed by the Apache-Perl package,     though.

  - NO-CAN: Several buffer overflows have been found in the     ApacheBench (ab) utility that could be exploited by a     remote server returning very long strings. No such     binary programs are distributed by the Apache-Perl     package, though.

These problems have been fixed in version 1.3.26-1-1.26-0woody2 for the current stable distribution (woody), in 1.3.9-14.1-1.21.20000309-1.1 for the old stable distribution (potato) and in version 1.3.26-1.1-1.27-3-1 for the unstable distribution (sid).

According to David Wagner, iDEFENSE and the Apache HTTP Server Project, several vulnerabilities have been found in the Apache package, a commonly used webserver. Most of the code is shared between the Apache and Apache-SSL packages, so vulnerabilities are shared as well. These vulnerabilities could allow an attacker to enact a denial of service against a server or execute a cross scripting attack, or steal cookies from other web site users. Vulnerabilities in the included legacy programs htdigest, htpasswd and ApacheBench can be exploited when called via CGI. Additionally the insecure temporary file creation in htdigest and htpasswd can also be exploited locally.
The Common Vulnerabilities and Exposures (CVE) project identified the following vulnerabilities :

  - CAN-2002-0839: A vulnerability exists on platforms using     System V shared memory based scoreboards. This     vulnerability allows an attacker to execute code under     the Apache UID to exploit the Apache shared memory     scoreboard format and send a signal to any process as     root or cause a local denial of service attack.
  - CAN-2002-0840: Apache is susceptible to a cross site     scripting vulnerability in the default 404 page of any     web server hosted on a domain that allows wildcard DNS     lookups.

  - CAN-2002-0843: There were some possible overflows in the     utility ApacheBench (ab) which could be exploited by a     malicious server.

  - CAN-2002-1233: A race condition in the htpasswd and     htdigest program enables a malicious local user to read     or even modify the contents of a password file or easily     create and overwrite files as the user running the     htpasswd (or htdigest respectively) program. (binaries     not included in apache-ssl package though)

  - CAN-2001-0131: htpasswd and htdigest in Apache 2.0a9,     1.3.14, and others allows local users to overwrite     arbitrary files via a symlink attack.

    This is the same vulnerability as CAN-2002-1233, which     was fixed in potato already but got lost later and was     never applied upstream. (binaries not included in     apache-ssl package though)

  - NO-CAN: Several buffer overflows have been found in the     ApacheBench (ab) utility that could be exploited by a     remote server returning very long strings. (binary not     included in apache-ssl package though) These problems have been fixed in version 1.3.26.1+1.48-0woody3 for the current stable distribution (woody) and in 1.3.9.13-4.2 for the old stable distribution (potato). Corrected packages for the unstable distribution (sid) are expected soon.

According to David Wagner, iDEFENSE and the Apache HTTP Server Project, several remotely exploitable vulnerabilities have been found in the Apache package, a commonly used webserver. These vulnerabilities could allow an attacker to enact a denial of service against a server or execute a cross scripting attack. The Common Vulnerabilities and Exposures (CVE) project identified the following vulnerabilities :

  - CAN-2002-0839: A vulnerability exists on platforms using     System V shared memory based scoreboards. This     vulnerability allows an attacker to execute code under     the Apache UID to exploit the Apache shared memory     scoreboard format and send a signal to any process as     root or cause a local denial of service attack.
  - CAN-2002-0840: Apache is susceptible to a cross site     scripting vulnerability in the default 404 page of any     web server hosted on a domain that allows wildcard DNS     lookups.

  - CAN-2002-0843: There were some possible overflows in the     utility ApacheBench (ab) which could be exploited by a     malicious server.

  - CAN-2002-1233: A race condition in the htpasswd and     htdigest program enables a malicious local user to read     or even modify the contents of a password file or easily     create and overwrite files as the user running the     htpasswd (or htdigest respectively) program.

  - CAN-2001-0131: htpasswd and htdigest in Apache 2.0a9,     1.3.14, and others allows local users to overwrite     arbitrary files via a symlink attack.

    This is the same vulnerability as CAN-2002-1233, which     was fixed in potato already but got lost later and was     never applied upstream.

  - NO-CAN: Several buffer overflows have been found in the     ApacheBench (ab) utility that could be exploited by a     remote server returning very long strings.
These problems have been fixed in version 1.3.26-0woody3 for the current stable distribution (woody) and in 1.3.9-14.3 for the old stable distribution (potato). Corrected packages for the unstable distribution (sid) are expected soon.

The remote host is running a version of Apache which is older than 1.3.27. This version contains several flaws that have been fixed in 1.3.27.

A number of vulnerabilities were discovered in Apache versions prior to 1.3.27. The first is regarding the use of shared memory (SHM) in Apache. An attacker that is able to execute code as the UID of the webserver (typically 'apache') is able to send arbitrary processes a USR1 signal as root. Using this vulnerability, the attacker can also cause the Apache process to continously span more children processes, thus causing a local DoS. Another vulnerability was discovered by Matthew Murphy regarding a cross site scripting vulnerability in the standard 404 error page. Finally, some buffer overflows were found in the 'ab' benchmark program that is included with Apache.

All of these vulnerabilities were fixed in Apache 1.3.27; the packages provided have these fixes applied.

Updated apache and httpd packages are available which fix a number of security issues for Red Hat Linux Advanced Server 2.1.

[Updated 06 Feb 2003] Added fixed packages for Advanced Workstation 2.1

The Apache HTTP server is a powerful, full-featured, efficient, and freely-available Web server.

Buffer overflows in the ApacheBench support program (ab.c) in Apache versions prior to 1.3.27 allow a malicious Web server to cause a denial of service and possibly execute arbitrary code via a long response. The Common Vulnerabilities and Exposures project has assigned the name CVE-2002-0843 to this issue.

Two cross-site scripting vulnerabilities are present in the error pages for the default '404 Not Found' error, and for the error response when a plain HTTP request is received on an SSL port. Both of these issues are only exploitable if the 'UseCanonicalName' setting has been changed to 'Off', and wildcard DNS is in use. These issues would allow remote attackers to execute scripts as other Web page visitors, for instance, to steal cookies. These issues affect versions of Apache 1.3 before 1.3.26, and versions of mod_ssl before 2.8.12.
The Common Vulnerabilities and Exposures project has assigned the names CVE-2002-0840 and CVE-2002-1157 to these issues.

The shared memory scoreboard in the HTTP daemon for Apache 1.3, prior to version 1.3.27, allowed a user running as the 'apache' UID to send a SIGUSR1 signal to any process as root, resulting in a denial of service (process kill) or other such behavior that would not normally be allowed. The Common Vulnerabilities and Exposures project has assigned the name CVE-2002-0839 to this issue.

All users of the Apache HTTP server are advised to upgrade to the applicable errata packages. For Red Hat Linux Advanced Server 2.1 these packages include Apache version 1.3.27 which is not vulnerable to these issues.

Note that the instructions in the 'Solution' section of this errata contain additional steps required to complete the upgrade process.

The remote host is running a version of Apache web server prior to 1.3.27. It is, therefore, affected by multiple vulnerabilities :

  - There is a cross-site scripting vulnerability caused by     a failure to filter HTTP/1.1 'Host' headers that are     sent by browsers.

  - A vulnerability in the handling of the Apache scorecard     could allow an attacker to cause a denial of service.

  - A buffer overflow vulnerability exists in the     'support/ab.c' read_connection() function. The ab.c file     is a benchmarking support utility that is provided with     the Apache web server.

ID	Name	Product	Family	Severity
17492	HP-UX PHSS_28111 : HP-UX Running Apache, Increased Privileges or Denial of Service (DoS) or Execution of Arbitrary Code (HPSBUX00224 SSRT2393 rev.3)	Nessus	HP-UX Local Security Checks	high
17491	HP-UX PHSS_28099 : HP-UX Running Apache, Increased Privileges or Denial of Service (DoS) or Execution of Arbitrary Code (HPSBUX00224 SSRT2393 rev.3)	Nessus	HP-UX Local Security Checks	high
17490	HP-UX PHSS_28098 : HP-UX Running Apache, Increased Privileges or Denial of Service (DoS) or Execution of Arbitrary Code (HPSBUX00224 SSRT2393 rev.3)	Nessus	HP-UX Local Security Checks	high
17118	HP-UX PHSS_28090 : HP-UX Running Apache, Increased Privileges or Denial of Service (DoS) or Execution of Arbitrary Code (HPSBUX00224 SSRT2393 rev.3)	Nessus	HP-UX Local Security Checks	high
16993	HP-UX PHSS_28705 : HP-UX Running Apache, Increased Privileges or Denial of Service (DoS) or Execution of Arbitrary Code (HPSBUX00224 SSRT2393 rev.3)	Nessus	HP-UX Local Security Checks	high
15032	Debian DSA-195-1 : apache-perl - several vulnerabilities	Nessus	Debian Local Security Checks	high
15025	Debian DSA-188-1 : apache-ssl - several vulnerabilities	Nessus	Debian Local Security Checks	high
15024	Debian DSA-187-1 : apache - several vulnerabilities	Nessus	Debian Local Security Checks	high
1488	Apache < 1.3.27 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	high
13968	Mandrake Linux Security Advisory : apache (MDKSA-2002:068)	Nessus	Mandriva Local Security Checks	high
12332	RHEL 2.1 : apache (RHSA-2002:251)	Nessus	Red Hat Local Security Checks	high
11137	Apache < 1.3.27 Multiple Vulnerabilities (DoS, XSS)	Nessus	Web Servers	high

Detections

Analytics

CVE-2002-0839

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

high