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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0637 -- [Solaris] Multiple Security Vulnerabilities in the FreeType2 library for Printer Font Binary (PFB) or TrueType Font (TTF) format font files may lead to a Denial of Service (DoS) or allow Execution of Arbitrary Code 15 August 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: FreeType2 Publisher: Sun Microsystems Operating System: Solaris Impact: Execute Arbitrary Code/Commands Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2008-1808 CVE-2008-1807 CVE-2008-1806 Ref: ESB-2008.0599 Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-239006-1 Revision History: August 15 2008: Patches Released June 20 2008: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Solution Type: Sun Alert Solution 239006 : Multiple Security Vulnerabilities in the FreeType2 library for Printer Font Binary (PFB) or TrueType Font (TTF) format font files may lead to a Denial of Service (DoS) or allow Execution of Arbitrary Code Bug ID: 6714118 Product Solaris 8 Operating System Solaris 9 Operating System Solaris 10 Operating System OpenSolaris Date of Workaround Release: 18-Jun-2008 Date of Resolved Release: 12-Aug-2008 SA Document Body Multiple Security Vulnerabilities in the FreeType2 library for Printer Font Binary (PFB) or TrueType Font (TTF) format font files may lead to a Denial of Service (DoS) or allow Execution of Arbitrary Code 1. Impact Multiple security vulnerabilities exist in the FreeType 2 library in Solaris when parsing Printer Font Binary (PFB) or TrueType Font (TTF) format font files. These vulnerabilites may allow a local unprivileged user to either cause an application using FreeType 2 as a font service to crash or to execute arbitrary commands with the privileges of the application. The ability to crash an application is a type of Denial of service (DoS). These issues are described in the following documents: http://labs.idefense.com/intelligence/vulnerabilities/display.php?i d=715 http://labs.idefense.com/intelligence/vulnerabilities/display.php?i d=716 http://labs.idefense.com/intelligence/vulnerabilities/display.php?i d=717 CVE-2008-1806 at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1806 CVE-2008-1807 at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1807 CVE-2008-1808 at http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1808 2. Contributing Factors These issues can occur in the following releases: SPARC Platform * Solaris 8 without patch 124420-04 * Solaris 9 without patch 116105-09 * Solaris 10 without patch 119812-06 * OpenSolaris based upon builds snv_01 through snv_92 x86 Platform * Solaris 8 without patch 124421-04 * Solaris 9 without patch 116106-08 * Solaris 10 without patch 119813-08 * OpenSolaris based upon builds snv_01 through snv_92 Notes: 1. Only OpenSolaris installations including the affected binary "/usr/lib/libfreetype.so.6" are impacted by this issue. 2. OpenSolaris distributions may include additional bug fixes above and beyond the base build from which it was derived. The base build can be derived as follows: $ uname -a SunOS osolsys 5.11 snv_86 i86pc i386 i86pc 3. Applications are impacted only if they link to the FreeType 2 library (libfreetype). A partial test to check if an application links with a library such as libfreetype is to use ldd(1): $ ldd /usr/bin/fc-cache | grep libfreetype libfreetype.so.6 => /usr/sfw/lib/libfreetype.so.6 4. A comprehensive test to check if an application links with a library such as libfreetype requires the use of pldd(1) against the running application since ldd(1) does not list any shared objects explicitly attached using dlopen(3C). For example: $ pldd `pgrep fc-cache` | grep libfreetype /usr/sfw/lib/libfreetype.so.6 3. Symptoms There are no predictable symptoms that would indicate that these issues have been exploited to execute arbitrary code. 4. Workaround The Xorg(1) X server is a privileged application available in OpenSolaris, Solaris 10, and Solaris 9 (x86 systems only) which links to the libfreetype library. In order to prevent these issues from being exploited against the Xorg(1) X server to execute arbitrary commands with the privileges of the Xorg(1) X server, the setuid(2) bit on x86 systems and the setgid(2) bit on SPARC systems can be removed. For example: # chmod 0755 /usr/X11/bin/Xorg On x86 systems running Solaris 10 Update 4 or later: # chmod 0755 /usr/X11/bin/i386/Xorg /usr/X11/bin/amd64/Xorg Similar chmod(1) commands can be applied on any setuid(2) or setgid(2) application that links to the Free Type library (libfreetype). Note 1: Removing the setuid(2) bit or the setgid(2) bit from the Xorg binary will disable the following: * The ability to start the Xorg(1) server from the command line for non-root users on Solaris 10. * The ability of Xorg(1) to open Unix domain sockets and named pipe transports in the protected "/tmp/.X11-*" directories. These features will still be available to Xorg when started via a display manager such as dtlogin(1), gdm(1), or xdm(1). Note 2: There is no workaround to prevent these issues from being exploited to cause a Denial of Service to the X Server. Note 3: Local users on the console of a system using an X display manager and Sun Ray users may still be able to exploit these vulnerabilities to execute arbitrary commands with elevated privileges even if the setuid(2) and setgid(2) permissions have been removed from the Xorg(1) binary. 5. Resolution These issues are addressed in the following releases: SPARC Platform * Solaris 8 with patch 124420-04 or later * Solaris 9 with patch 116105-09 or later * Solaris 10 with patch 119812-06 or later * OpenSolaris based upon build snv_93 or later x86 Platform * Solaris 8 with patch 124421-04 or later * Solaris 9 with patch 116106-08 or later * Solaris 10 with patch 119813-08 or later * OpenSolaris based upon build snv_93 or later For more information on Security Sun Alerts, see Technical Instruction ID 213557. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBSKUBLSh9+71yA2DNAQIjjQP/Yr59B+01zrFDJ7nT5o+YA9AJ8laus4NW /wIlKEyRDNaUF6UpTrLNBkBTdkgEb6emtfC/GqH/EnBg3q2BzQ2m1HWbJLVxSoYK LL7OKD2qfBTeItOmh+hq1NWpeFJB1pv6dKh27aWbpWh9sn2+YW8H1ZtY9G8SfIMm kPHeKX5xfmE= =B/0u -----END PGP SIGNATURE-----