Multiple security vulnerabilities has been identified and fixed in apr-util :

The apr_strmatch_precompile function in strmatch/apr_strmatch.c in Apache APR-util before 1.3.5 allows remote attackers to cause a denial of service (daemon crash) via crafted input involving (1) a .htaccess file used with the Apache HTTP Server, (2) the SVNMasterURI directive in the mod_dav_svn module in the Apache HTTP Server, (3) the mod_apreq2 module for the Apache HTTP Server, or (4) an application that uses the libapreq2 library, related to an underflow flaw.
(CVE-2009-0023).

The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564 (CVE-2009-1955).

Off-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms allows remote attackers to obtain sensitive information or cause a denial of service (application crash) via crafted input (CVE-2009-1956).

The updated packages have been patched to prevent this.

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

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. The httpd package shipped with Red Hat Enterprise Linux 3 contains an embedded copy of the Apache Portable Runtime (APR) utility library, a free library of C data structures and routines, which includes interfaces to support XML parsing, LDAP connections, database interfaces, URI parsing, and more.

An off-by-one overflow flaw was found in the way apr-util processed a variable list of arguments. An attacker could provide a specially crafted string as input for the formatted output conversion routine, which could, on big-endian platforms, potentially lead to the disclosure of sensitive information or a denial of service (application crash). (CVE-2009-1956)

Note: The CVE-2009-1956 flaw only affects big-endian platforms, such as the IBM S/390 and PowerPC. It does not affect users using the httpd package on little-endian platforms, due to their different organization of byte ordering used to represent particular data.

A denial of service flaw was found in the apr-util Extensible Markup Language (XML) parser. A remote attacker could create a specially crafted XML document that would cause excessive memory consumption when processed by the XML decoding engine. (CVE-2009-1955)

A heap-based underwrite flaw was found in the way apr-util created compiled forms of particular search patterns. An attacker could formulate a specially crafted search keyword, that would overwrite arbitrary heap memory locations when processed by the pattern preparation engine. (CVE-2009-0023)

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.

Update to upstream version 1.3.7, see:
http://svn.apache.org/repos/asf/apr /apr-util/tags/1.3.7/CHANGES Security fixes: - CVE-2009-0023 Fix underflow in apr_strmatch_precompile. - CVE-2009-1955 Fix a denial of service attack against the apr_xml_* interface using the 'billion laughs' entity expansion technique. - CVE-2009-1956 Fix off by one overflow in apr_brigade_vprintf. Note: CVE-2009-1956 is only an issue on big-endian architectures.

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.

Multiple security vulnerabilities has been identified and fixed in apr and apr-util :

Multiple integer overflows in the Apache Portable Runtime (APR) library and the Apache Portable Utility library (aka APR-util) 0.9.x and 1.3.x allow remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via vectors that trigger crafted calls to the (1) allocator_alloc or (2) apr_palloc function in memory/unix/apr_pools.c in APR; or crafted calls to the (3) apr_rmm_malloc, (4) apr_rmm_calloc, or (5) apr_rmm_realloc function in misc/apr_rmm.c in APR-util; leading to buffer overflows. NOTE: some of these details are obtained from third-party information (CVE-2009-2412).

The apr_strmatch_precompile function in strmatch/apr_strmatch.c in Apache APR-util before 1.3.5 allows remote attackers to cause a denial of service (daemon crash) via crafted input involving (1) a .htaccess file used with the Apache HTTP Server, (2) the SVNMasterURI directive in the mod_dav_svn module in the Apache HTTP Server, (3) the mod_apreq2 module for the Apache HTTP Server, or (4) an application that uses the libapreq2 library, related to an underflow flaw.
(CVE-2009-0023).

The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564 (CVE-2009-1955).

Off-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms allows remote attackers to obtain sensitive information or cause a denial of service (application crash) via crafted input (CVE-2009-1956).

Packages for 2008.0 are provided for Corporate Desktop 2008.0 customers

The updated packages have been patched to prevent this.

According to its banner, the version of Apache 2.2.x. running on the remote host is prior to 2.2.12. It is, therefore, affected by the following vulnerabilities :

  - A heap-based buffer underwrite flaw exists in the     function 'apr_strmatch_precompile()' in the bundled copy     of the APR-util library, which could be triggered when     parsing configuration data to crash the daemon.
    (CVE-2009-0023)

  - A flaw in the mod_proxy_ajp module in version 2.2.11     only may allow a remote attacker to obtain sensitive     response data intended for a client that sent an     earlier POST request with no request body.
    (CVE-2009-1191)

  - The server does not limit the use of directives in a     .htaccess file as expected based on directives such     as 'AllowOverride' and 'Options' in the configuration     file, which could enable a local user to bypass     security restrictions. (CVE-2009-1195)

  - Failure to properly handle an amount of streamed data     that exceeds the Content-Length value allows a remote     attacker to force a proxy process to consume CPU time     indefinitely when mod_proxy is used in a reverse proxy     configuration. (CVE-2009-1890)

  - Failure of mod_deflate to stop compressing a file when     the associated network connection is closed may allow a     remote attacker to consume large amounts of CPU if     there is a large (>10 MB) file available that has     mod_deflate enabled. (CVE-2009-1891)

  - Using a specially crafted XML document with a large     number of nested entities, a remote attacker may be     able to consume an excessive amount of memory due to     a flaw in the bundled expat XML parser used by the     mod_dav and mod_dav_svn modules. (CVE-2009-1955)

  - There is an off-by-one overflow in the function     'apr_brigade_vprintf()' in the bundled copy of the     APR-util library in the way it handles a variable list     of arguments, which could be leveraged on big-endian     platforms to perform information disclosure or denial     of service attacks. (CVE-2009-1956)

Note that Nessus has relied solely on the version in the Server response header and did not try to check for the issues themselves or even whether the affected modules are in use.

This update of libapr-util1 fixes a memory consumption bug in the XML parser that can cause a remote denial-of-service vulnerability in applications using APR (WebDAV for example) (CVE-2009-1955).
Additionally a one byte buffer overflow in function apr_brigade_vprintf() (CVE-2009-1956) and buffer underflow in function apr_strmatch_precompile() (CVE-2009-0023) was fixed too. Depending on the application using this function it can lead to remote denial of service or information leakage.

The remote host is running a version of Mac OS X 10.5 that does not have Security Update 2009-006 applied.

This security update contains fixes for the following products :

  - AFP Client
  - Adaptive Firewall
  - Apache
  - Apache Portable Runtime
  - ATS
  - Certificate Assistant
  - CoreGraphics
  - CUPS
  - Dictionary
  - DirectoryService
  - Disk Images
  - Event Monitor
  - fetchmail
  - FTP Server
  - Help Viewer
  - International Components for Unicode
  - IOKit
  - IPSec
  - libsecurity
  - libxml
  - OpenLDAP
  - OpenSSH
  - PHP
  - QuickDraw Manager
  - QuickLook
  - FreeRADIUS
  - Screen Sharing
  - Spotlight
  - Subversion

ID	Name	Product	Family	Published	Updated	Severity
39323	Mandriva Linux Security Advisory : apr-util (MDVSA-2009:131)	Nessus	Mandriva Local Security Checks	6/8/2009	1/6/2021	high
39438	CentOS 3 : httpd (CESA-2009:1108)	Nessus	CentOS Local Security Checks	6/18/2009	1/4/2021	high
39505	Fedora 11 : apr-util-1.3.7-1.fc11 (2009-6261)	Nessus	Fedora Local Security Checks	6/25/2009	1/11/2021	high
43000	Mandriva Linux Security Advisory : apr (MDVSA-2009:314)	Nessus	Mandriva Local Security Checks	12/4/2009	1/6/2021	critical
40467	Apache 2.2.x < 2.2.12 Multiple Vulnerabilities	Nessus	Web Servers	8/2/2009	4/27/2020	high
41543	SuSE 10 Security Update : libapr-util1 (ZYPP Patch Number 6289)	Nessus	SuSE Local Security Checks	9/24/2009	1/14/2021	high
42433	Mac OS X Multiple Vulnerabilities (Security Update 2009-006)	Nessus	MacOS X Local Security Checks	11/9/2009	5/28/2024	critical

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