Apache HTTP Server socket starvation denial of service

apache-socket-starvation-dos (15540)

Medium Risk

Description:

Apache HTTP Server is vulnerable to a denial of service, caused by a listening socket starvation vulnerability. By establishing a connection, for a short period of time, to a listening socket that is rarely accessed, a remote attacker could cause the server to deny new connection requests until another connection is established on the socket.

Platforms Affected:

• Apache, HTTP Server 2.0
• Apache, HTTP Server 2.0 A9
• Apache, HTTP Server 2.0.28 Beta
• Apache, HTTP Server 2.0.28
• Apache, HTTP Server 2.0.32 Beta
• Apache, HTTP Server 2.0.32
• Apache, HTTP Server 2.0.34 Beta
• Apache, HTTP Server 2.0.35
• Apache, HTTP Server 2.0.36
• Apache, HTTP Server 2.0.37
• Apache, HTTP Server 2.0.38
• Apache, HTTP Server 2.0.39
• Apache, HTTP Server 2.0.40
• Apache, HTTP Server 2.0.41
• Apache, HTTP Server 2.0.42
• Apache, HTTP Server 2.0.43
• Apache, HTTP Server 2.0.44
• Apache, HTTP Server 2.0.45
• Apache, HTTP Server 2.0.46
• Apache, HTTP Server 2.0.47
• Apache, HTTP Server 2.0.48
• Apache, HTTP Server 2.0.49
• Apple, Mac OS X 10.2.8
• Apple, Mac OS X 10.3.6
• Apple, Mac OS X Server 10.2.8
• Apple, Mac OS X Server 10.3.6
• Compaq, Tru64 5.1b
• Conectiva, Linux 8.0
• Conectiva, Linux 9.0
• Gentoo, Linux
• HP, HP-UX 11.04
• MandrakeSoft, Mandrake Linux 10.0 AMD64
• MandrakeSoft, Mandrake Linux 10.0
• MandrakeSoft, Mandrake Linux 9.1
• MandrakeSoft, Mandrake Linux 9.1 PPC
• MandrakeSoft, Mandrake Linux 9.2
• MandrakeSoft, Mandrake Linux 9.2 AMD64
• MandrakeSoft, Mandrake Linux Corporate Server 2.1 X86_64
• MandrakeSoft, Mandrake Linux Corporate Server 2.1
• MandrakeSoft, Mandrake Multi Network Firewall 8.2
• Novell, UnitedLinux 1.0
• OpenPKG, OpenPKG 1.3
• OpenPKG, OpenPKG 2.0
• OpenPKG, OpenPKG CURRENT
• Slackware, Slackware Linux 8.1
• Slackware, Slackware Linux 9.0
• Slackware, Slackware Linux 9.1
• Slackware, Slackware Linux current
• Sun, Solaris 8
• Sun, Solaris 9
• SuSE, SuSE Linux 8.1
• SuSE, SuSE Linux 9.0
• SuSE, SuSE Linux 9.1
• SuSE, SuSE Linux Connectivity Server
• SuSE, SuSE Linux Database Server
• SuSE, SuSE Linux Desktop 1.0
• SuSE, SuSE Linux Enterprise Server 7.0
• SuSE, SuSE Linux Office Server
• Trustix, Secure Linux 1.5
• Trustix, Secure Linux 2.0
• Trustix, Secure Linux 2.1
• Turbolinux, Turbolinux 7 Server
• Turbolinux, Turbolinux 7 Workstation
• Turbolinux, Turbolinux 8 Server
• Turbolinux, Turbolinux 8 Workstation
• Turbolinux, Turbolinux Advanced Server 6
• Turbolinux, Turbolinux Appliance Server 1.0 Hosting Ed
• Turbolinux, Turbolinux Appliance Server 1.0 Workgroup Ed
• Turbolinux, Turbolinux Server 6.1
• Turbolinux, Turbolinux Server 6.5
• Turbolinux, Turbolinux Workstation 6.0

Remedy:

Upgrade to the latest version of Apache HTTP Server (2.0.49 or later), available from the Apache HTTP Server Web site. See References.

For Trustix Secure Linux:
Upgrade to the latest apache package, as listed below. Refer to Trustix Secure Linux Security Advisory #2004-0017 for more information. See References.

Trustix Secure Linux 2.0: 2.0.49-2tr or later
Trustix Secure Linux 2.1: 2.0.49-2tr or later

For Trustix Secure Linux:
Upgrade to the latest apache package, as listed below. Refer to Trustix Secure Linux Security Advisory #2004-0027 for more information. See References.

Trustix Secure Linux 1.5: 1.3.31-1tr or later

For Conectiva Linux:
Upgrade to the latest apache package, as listed below. Refer to Conectiva Linux Security Announcement CLSA-2004:839. See References.

Conectiva Linux 8: 1.3.28-1U80_3cl or later
Conectiva Linux 9: 2.0.45-2879OU90_6cl or later

For Slackware Linux:
Upgrade to the latest apache package, as listed below. Refer to slackware-security Mailing List, Wed, 12 May 2004 16:54:58 -0700 (PDT) for more information. See References.

Slackware Linux 8.1 and 9.0: 1.3.29-i386-2 or later
Slackware Linux 9.1: 1.3.29-i486-2 or later
Slackware Linux -current: 1.3.31-i486-1

or Mandrake Linux:
Upgrade to the latest apache package, as listed below. Refer to MandrakeSoft Security Advisory MDKSA-2004:046 : apache for more information. See References.

Mandrake Linux 9.1: 1.3.27_1.3.4-7.1.91mdk or later
Mandrake Linux 9.2: 1.3.28_1.3.4-1.1.92mdk or later
Mandrake Linux Multi Network Firewall 8.2: 1.3.23-4.4.M82mdk or later
Mandrake Linux Corporate Server 2.1: 1.3.26-7.1.C21mdk or later
Mandrake Linux 10.0: 1.3.29-1.1.100mdk or later

For Gentoo Linux:
Upgrade to the latest version of apache (1.3.31 or later), as listed in GLSA 200405-22. See References.

For HP Tru64 UNIX 5.1B:
Apply the appropriate Early Release Patches (ERPs) for your system, as listed in HP Security Bulletin HPSBTU01049. See References.

For HP-UX B.11.04 with Virtualvault 4.7, Virtualvault 4.6, or Virtualvault 4.5:
Apply the appropriate patches for your system, as listed in HP Security Bulletin HPSBUX01069. See References.

For Sun Solaris:
Apply the appropriate patch for your system, as listed below. Refer to Sun Alert ID: 57628 for more information. See References.

SPARC Platform
Solaris 8 with patch 116973-01 or later
Solaris 9 with patch 113146-05 or later

x86 Platform
Solaris 8 with patch 116974-01 or later
Solaris 9 with patch 114145-04 or later

For Mac OS:
Apply Security Update 2004-12-02, as listed in AppleCare Knowledge Base Document 61798. See References.

For OpenPKG:
Refer to OpenPKG Security Advisory OpenPKG-SA-2004.021 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

Consequences:

Denial of Service

References:

• Apache HTTP Server Project Web site, Welcome! - The Apache HTTP Server Project at http://httpd.apache.org/.
• AppleCare Knowledge Base Document 61798, Security Update 2004-12-02 at http://docs.info.apple.com/article.html?artnum=61798.
• CIAC Information Bulletin O-128, Apache HTTP Server 2.0.49 Release Fixes Security Vulnerabilities at http://www.ciac.org/ciac/bulletins/o-128.shtml.
• CIAC Information Bulletin O-128, Apache HTTP Server 2.0.49 Release Fixes Security Vulnerabilities [REVISED 4 Aug 2004] at http://www.ciac.org/ciac/bulletins/o-128.shtml.
• CIAC Information Bulletin O-128, Apache HTTP Server 2.0.49 Release Fixes Security Vulnerabilities [REVISED 7 July 2004] at http://www.ciac.org/ciac/bulletins/o-128.shtml.
• CIAC Information Bulletin O-138, Apple Mac OS X Jaguar and Panther Security Vulnerabilities at http://www.ciac.org/ciac/bulletins/o-138.shtml.
• CIAC Information Bulletin P-049, Apple Security Update 2004-12-02 at http://www.ciac.org/ciac/bulletins/p-049.shtml.
• Conectiva Linux Security Announcement CLSA-2004:839, DoS in mod_ssl and log escape sequences vulnerability at http://distro.conectiva.com/atualizacoes/index.php?id=a&anuncio=000839.
• GLSA 200405-22, Apache 1.3: Multiple vulnerabilities at http://www.linuxsecurity.com/content/view/106111/104/.
• slackware-security Mailing List, Wed, 12 May 2004 16:54:58 -0700 (PDT), apache (SSA:2004-133-01) at http://www.slackware.org/security/viewer.php?l=slackware-security&y=2004&m=slackware-security.529643.
• Sun Alert ID: 57628, Security Vulnerabilities in the Apache Web Server and Apache Modules at http://sunsolve.sun.com/search/document.do?assetkey=1-26-57628-1.
• Sun Alert ID: 57628, Security Vulnerabilities in the Apache Web Server and Apache Modules at http://sunsolve.sun.com/search/document.do?assetkey=1-26-57628-1&searchclause=.
• Trustix Secure Linux Security Advisory #2004-0017, apache at http://www.linuxsecurity.com/content/view/105880/109/. (From LinuxSecurity archive)
• Trustix Secure Linux Security Advisory #2004-0027, apache at http://www.linuxsecurity.com/content/view/106042/109/.
• BID-9921: Apache Connection Blocking Denial Of Service Vulnerability
• CVE-2004-0174: Apache 1.4.x before 1.3.30, and 2.0.x before 2.0.49, when using multiple listening sockets on certain platforms, allows remote attackers to cause a denial of service (blocked new connections) via a short-lived connection on a rarely-accessed listening socket.
• GLSA-200405-22: Apache 1.3: Multiple vulnerabilities
• MDKSA-2004:046: Updated apache packages fix a number of vulnerabilities
• OpenPKG-SA-2004.021: Apache
• SA11170: Apache Connection Denial of Service Vulnerability
• SECTRACK ID: 1009495: Apache Web Server Socket Starvation Flaw May Let Remote Users Deny Service
• SUSE-SA:2003:014: kdelibs: remote file creation
• SUSE-SA:2004:008: cvs: remote code execution
• SUSE-SA:2004:009: Linux Kernel: local privilege escalation / information leakage
• SUSE-SA:2004:012: mc: local privilege escalation
• SUSE-SA:2004:015: cvs: remote command execution

Reported:

Mar 19, 2004

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