Integer underflow in Freetype before 2.2 allows remote attackers to cause a denial of service (crash) via a font file with an odd number of blue values, which causes the underflow when decrementing by 2 in a context that assumes an even number of values.

The remote host is running a version of Mac OS X 10.4 that does not have Security Update 2009-002 applied.

This security update contains fixes for the following products :

  - Apache
  - ATS
  - BIND
  - CoreGraphics
  - Cscope
  - CUPS
  - Disk Images
  - enscript
  - Flash Player plug-in
  - Help Viewer
  - IPSec
  - Kerberos
  - Launch Services
  - libxml
  - Net-SNMP
  - Network Time
  - OpenSSL
  - QuickDraw Manager
  - Spotlight
  - system_cmds
  - telnet
  - Terminal
  - X11

Several integer overflows have been discovered in the FreeType library. By tricking a user into installing and/or opening a specially crafted font file, these could be exploited to execute arbitrary code with the privileges of that user.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Fixes for: CVE-2006-0747, CVE-2006-1054, CVE-2006-1861, CVE-2006-2493, CVE-2006-2661. This patch fixes a few integer overflows in freetype 2.
Without this patch it is possible to create font files which make freetype 2 crash.

Several problems have been discovered in the FreeType 2 font engine.
The Common vulnerabilities and Exposures project identifies the following problems :

  - CVE-2006-0747     Several integer underflows have been discovered which     could allow remote attackers to cause a denial of     service.

  - CVE-2006-1861     Chris Evans discovered several integer overflows that     lead to a denial of service or could possibly even lead     to the execution of arbitrary code.

  - CVE-2006-2493     Several more integer overflows have been discovered     which could possibly lead to the execution of arbitrary     code.

  - CVE-2006-2661     A NULL pointer dereference could cause a denial of     service.

SecurityTracker reports :

A vulnerability was reported in FreeType. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted font file that, when loaded by the target user's system, will trigger an integer underflow or integer overflow and crash the application or execute arbitrary code on the target system.

Chris Evans reported these vulnerabilities.

Impact: A remote user can create a file that, when loaded by the target user, will execute arbitrary code on the target user's system.

Updated freetype packages that fix several security flaws are now available for Red Hat Enterprise Linux.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

FreeType is a free, high-quality, and portable font engine.

Chris Evans discovered several integer underflow and overflow flaws in the FreeType font engine. If a user loads a carefully crafted font file with a program linked against FreeType, it could cause the application to crash or execute arbitrary code as the user. While it is uncommon for a user to explicitly load a font file, there are several application file formats which contain embedded fonts that are parsed by FreeType. (CVE-2006-0747, CVE-2006-1861, CVE-2006-3467)

A NULL pointer dereference flaw was found in the FreeType font engine.
An application linked against FreeType can crash upon loading a malformed font file. (CVE-2006-2661)

Users of FreeType should upgrade to these updated packages, which contain backported patches to correct these issues.

Integer underflow in Freetype before 2.2 allows remote attackers to cause a denial of service (crash) via a font file with an odd number of blue values, which causes the underflow when decrementing by 2 in a context that assumes an even number of values. (CVE-2006-0747)

Multiple integer overflows in FreeType before 2.2 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via attack vectors related to (1) bdf/bdflib.c, (2) sfnt/ttcmap.c, (3) cff/cffgload.c, and (4) the read_lwfn function and a crafted LWFN file in base/ftmac.c. (CVE-2006-1861)

Ftutil.c in Freetype before 2.2 allows remote attackers to cause a denial of service (crash) via a crafted font file that triggers a null dereference. (CVE-2006-2661)

In addition, a patch is applied to 2.1.10 in Mandriva 2006 to fix a serious bug in ttkern.c that caused some programs to go into an infinite loop when dealing with fonts that don't have a properly sorted kerning sub-table. This patch is not applicable to the earlier Mandriva releases.

Update :

The previous update introduced some issues with other applications and libraries linked to libfreetype, that were missed in testing for the vulnerability issues. The new packages correct these issues.

ID	Name	Product	Family	Severity
38743	Mac OS X Multiple Vulnerabilities (Security Update 2009-002)	Nessus	MacOS X Local Security Checks	critical
27863	Ubuntu 5.04 / 5.10 / 6.06 LTS : freetype vulnerabilities (USN-291-1)	Nessus	Ubuntu Local Security Checks	high
27224	openSUSE 10 Security Update : freetype2 (freetype2-1608)	Nessus	SuSE Local Security Checks	high
22637	Debian DSA-1095-1 : freetype - integer overflows	Nessus	Debian Local Security Checks	high
22503	FreeBSD : freetype -- LWFN Files Buffer Overflow Vulnerability (b975763f-5210-11db-8f1a-000a48049292)	Nessus	FreeBSD Local Security Checks	high
22068	RHEL 2.1 / 3 / 4 : freetype (RHSA-2006:0500)	Nessus	Red Hat Local Security Checks	high
22064	CentOS 3 / 4 : freetype (CESA-2006:0500)	Nessus	CentOS Local Security Checks	high
21715	Mandrake Linux Security Advisory : freetype2 (MDKSA-2006:099-1)	Nessus	Mandriva Local Security Checks	high

Detections

Analytics

CVE-2006-0747

high

Tenable Plugins

critical

high

high

high

high

high

high

high