__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Perl Insecure Temporary Files/Directories [DSA-620-1 perl -- insecure temporary files / directories] January 3, 2005 20:00 GMT Number P-086 [REVISED 22 Feb 2005] ______________________________________________________________________________ PROBLEM: A vulnerability was discovered in the rmtree function in File::Path module in Perl 5.6.1 and 5.8.4. Also vulnerabilities in multiple scripts may allow a symlink attack on temporary files. PLATFORM: Perl 5.6.1, 5.8.4 Debian GNU/Linux 3.0 (woody) Red Hat Desktop (v. 4) Red Hat Enterprise Linux AS, ES, WS (v. 4) DAMAGE: A race condition in the rmtree function in the File::Path module in Perl 5.6.1 and 5.8.4 sets read/write permissions for the world, allowing local users to delete files and directories and possible read files and directories via a symlink attack. Multiple scripts in the Perl package allow local users to overwrite files via a symlink attack on temporary files. SOLUTION: Apply the available security updates. ______________________________________________________________________________ VULNERABILITY The risk is LOW. Symlink attacks are typically difficult to ASSESSMENT: exploit. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/p-086.shtml ORIGINAL BULLETIN: http://www.debian.org/security/2004/dsa-620 ADDITIONAL LINK: Red Hat Security Advisory RHSA-2005:103-04 https://rhn.redhat.com/errata/RHSA-2005-103.html CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CAN-2004-0452, CAN-2004-0976 ______________________________________________________________________________ REVISION HISTORY: 02/22/2005 - revised to add a link to Red Hat Security Advisory RHSA-2005:103-04 for Red Hat Desktop (v. 4) and Red Hat Enterprise Linux AS, ES, WS (v. 4). [***** Start DSA-620-1 perl -- insecure temporary files / directories *****] Debian Security Advisory DSA-620-1 perl -- insecure temporary files / directories Date Reported: 30 Dec 2004 Affected Packages: perl Vulnerable: Yes Security database references: In Mitre's CVE dictionary: CAN-2004-0452, CAN-2004-0976. More information: Several vulnerabilities have been discovered in Perl, the popular scripting language. The Common Vulnerabilities and Exposures project identifies the following problems: CAN-2004-0452 Jeroen van Wolffelaar discovered that the rmtree() function in the File::Path module removes directory trees in an insecure manner which could lead to the removal of arbitrary files and directories through a symlink attack. CAN-2004-0976 Trustix developers discovered several insecure uses of temporary files in many modules which allow a local attacker to overwrite files via a symlink attack. For the stable distribution (woody) these problems have been fixed in version 5.6.1-8.8. For the unstable distribution (sid) these problems have been fixed in version 5.8.4-5. We recommend that you upgrade your perl packages. Fixed in: Debian GNU/Linux 3.0 (woody) Source: http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8.dsc http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8.diff.gz http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1.orig.tar.gz Architecture-independent component: http://security.debian.org/pool/updates/main/p/perl/libcgi-fast-perl_5.6.1- 8.8_all.deb http://security.debian.org/pool/updates/main/p/perl/perl-doc_5.6.1-8.8_all. deb http://security.debian.org/pool/updates/main/p/perl/perl-modules_5.6.1-8.8_ all.deb Alpha: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ alpha.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ alpha.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_alpha. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ alpha.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ alpha.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ alpha.deb ARM: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ arm.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ arm.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_arm. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ arm.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ arm.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ arm.deb Intel IA-32: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8 _i386.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ i386.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_i386. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ i386.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ i386.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ i386.deb Intel IA-64: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1- 8.8_ia64.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1- 8.8_ia64.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_ia64. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ ia64.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ ia64.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ ia64.deb HPPA: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ hppa.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ hppa.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_hppa. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ hppa.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ hppa.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ hppa.deb Motorola 680x0: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ m68k.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ m68k.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_m68k. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ m68k.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ m68k.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ m68k.deb Big endian MIPS: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ mips.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ mips.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_mips. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ mips.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ mips.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ mips.deb Little endian MIPS: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ mipsel.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ mipsel.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_mipsel. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ mipsel.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ mipsel.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ mipsel.deb PowerPC: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ powerpc.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ powerpc.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_powerpc. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ powerpc.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ powerpc.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ powerpc.deb IBM S/390: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ s390.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ s390.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_s390. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ s390.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8 _s390.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ s390.deb Sun Sparc: http://security.debian.org/pool/updates/main/p/perl/libperl-dev_5.6.1-8.8_ sparc.deb http://security.debian.org/pool/updates/main/p/perl/libperl5.6_5.6.1-8.8_ sparc.deb http://security.debian.org/pool/updates/main/p/perl/perl_5.6.1-8.8_sparc. deb http://security.debian.org/pool/updates/main/p/perl/perl-base_5.6.1-8.8_ sparc.deb http://security.debian.org/pool/updates/main/p/perl/perl-debug_5.6.1-8.8_ sparc.deb http://security.debian.org/pool/updates/main/p/perl/perl-suid_5.6.1-8.8_ sparc.deb MD5 checksums of the listed files are available in the original advisory. [***** End DSA-620-1 perl -- insecure temporary files / directories *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Debian for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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