Secunia reports :

Some vulnerabilities have been reported in APR-util, which can be exploited by malicious users and malicious people to cause a DoS (Denial of Service).

A vulnerability is caused due to an error in the processing of XML files and can be exploited to exhaust all available memory via a specially crafted XML file containing a predefined entity inside an entity definition.

A vulnerability is caused due to an error within the 'apr_strmatch_precompile()' function in strmatch/apr_strmatch.c, which can be exploited to crash an application using the library.

RedHat reports :

A single NULL byte buffer overflow flaw was found in apr-util's apr_brigade_vprintf() function.

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.

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.

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.

The following bugs have been fixed : 

  - Integer overflows in libapr could potentially be     exploited to execute arbitrary code. (CVE-2009-2412)

  - Specially crafted XML documents cause apache to consume     large amounts of memory. (CVE-2009-1955)

ID	Name	Product	Family	Published	Updated	Severity
39320	FreeBSD : apr -- multiple vulnerabilities (eb9212f7-526b-11de-bbf2-001b77d09812)	Nessus	FreeBSD Local Security Checks	6/8/2009	1/6/2021	high
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
41543	SuSE 10 Security Update : libapr-util1 (ZYPP Patch Number 6289)	Nessus	SuSE Local Security Checks	9/24/2009	1/14/2021	high
43000	Mandriva Linux Security Advisory : apr (MDVSA-2009:314)	Nessus	Mandriva Local Security Checks	12/4/2009	1/6/2021	critical
46217	SuSE9 Security Update : Apache 2 (YOU Patch Number 12613)	Nessus	SuSE Local Security Checks	5/4/2010	1/14/2021	critical

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