From thomas@suse.de Tue Oct 8 05:18:19 2002 From: Thomas Biege To: bugtraq@securityfocus.com Date: Mon, 7 Oct 2002 11:21:47 +0200 (CEST) Subject: SuSE Security Announcement: hylafax (SuSE-SA:2002:035) -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: hylafax Announcement-ID: SuSE-SA:2002:035 Date: Friday, Oct 4th 2002 10:30 MEST Affected products: 7.0, 7.1, 7.2, 7.3, 8.0 SuSE Linux Connectivity Server SuSE Linux Enterprise Server SuSE Linux Office Server Vulnerability Type: remote privilege escalation Severity (1-10): 4 SuSE default package: no Cross References: CAN-2002-1050 Content of this advisory: 1) security vulnerability resolved: - format string bug in logging code for TSI - buffer overflow in faxgetty while handling image data 2) pending vulnerabilities, solutions, workarounds: - glibc - ghostview/kghostview - fetchmail - kdelibs - ethereal 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information HylaFAX is a client-server architecture for receiving and sending facsimiles. The logging function of faxgetty prior version 4.1.3 was vulnerable to a format string bug when handling the TSI value of a received facsimile. This bug could easily be used to trigger a denial-of-service attack or to execute arbitrary code remotely. Another bug in faxgetty, a buffer overflow, can be abused by a remote attacker by sending a large line of image data to execute arbitrary commands too. Several format string bugs in local helper applications were fixed too. These bugs can not be exploited to gain higher privileges on a system running SuSE Linux because of the absence of setuid bits. The hylafax package is not installed by default. A temporary fix is not known. Please download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update. Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web. i386 Intel Platform: SuSE-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-285.i386.patch.rpm 3115ebdb9e65027f35809463c5e6ae7e SuSE-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-285.i386.rpm 07b0f2d015b0fd83c5bb9be548e7b8fb source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/hylafax-4.1-285.src.rpm 8231586e2de356c737ef3d6f9d17c0ea SuSE-7.3 ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/hylafax-4.1-284.i386.rpm de51bda21cc9ee1a4dd3cd06ccccf71e source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/hylafax-4.1-284.src.rpm aac2ecddf06934f286960f52f2e7670e SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n3/hylafax-4.1beta2-376.i386.rpm 275c73b0b192da9c883cfebf6638604e source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/hylafax-4.1beta2-376.src.rpm b8698144b8bb859d880659fcf01eb020 SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/n3/hylafax-4.1beta2-375.i386.rpm c322bc9007191e3692341b5702b29200 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/hylafax-4.1beta2-375.src.rpm 4d76cd426565e411941b4aaebf6ad761 SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/n2/hylafax-4.1beta2-373.i386.rpm fa7399ce161a44dbad630928cd6b3b84 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/hylafax-4.1beta2-373.src.rpm 0ac9d8b33b75f29b55a5750f17a65b93 Sparc Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/hylafax-4.1-112.sparc.rpm 1cabb4113f858df010d305fa576c5a02 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/hylafax-4.1-112.src.rpm a5ddaee97231c423e04fb71b757532a3 SuSE-7.1 ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n3/hylafax-4.1beta2-218.sparc.rpm 1449e568071f5fb6080efebb8f2a7a2b source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/hylafax-4.1beta2-218.src.rpm bf8c780206da51bc548e9fd4264b9bfc SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n2/hylafax-4.1beta2-218.sparc.rpm bb265465ea8b84ca31b5c954266daf1d source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/hylafax-4.1beta2-218.src.rpm b5bcae601fe056f399fc8696aa156529 AXP Alpha Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/axp/update/7.1/n3/hylafax-4.1beta2-245.alpha.rpm 45d0fd7061f10e4bef9e57c42a9b160d source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/hylafax-4.1beta2-245.src.rpm baf364ec3636077fe8f810edeb111572 SuSE-7.0 ftp://ftp.suse.com/pub/suse/axp/update/7.0/n2/hylafax-4.1beta2-244.alpha.rpm 856e96ce4a165b74e70ebc9ef3201672 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/hylafax-4.1beta2-244.src.rpm f68e2260aa36d4d218a3f3589333ea0e PPC Power PC Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/hylafax-4.1-189.ppc.rpm 79846b9ae0f75f8ed9b17fed07ba6263 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/hylafax-4.1-189.src.rpm 98a123cf18cb6b34ffd9018a76ad161f SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n3/hylafax-4.1beta2-218.ppc.rpm 2bfe866f1bd1d93307449de95d84d6c2 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/hylafax-4.1beta2-218.src.rpm 972c605bd3a9cc15bbbc5aa188dfc864 SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n2/hylafax-4.1beta2-217.ppc.rpm 00b1ae1c91235ecceb287ffe7aced175 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/hylafax-4.1beta2-217.src.rpm e905325a032854fb653cf458e0db8942 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - glibc Client applications which use res_search/res_nsreach and/or res_query()/ res_nquery() of libresolv could trigger a DNS decoding error, a SEGV or leak information by reading beyond the end of a too small 'answer' buffer. The update packages are being built and tested. We will publish a security announcement as soon as they are ready. - ghostview/kghostview Bufferoverflows have recently been discovered in these packages. They allow attackers to execute arbitrary code with the privileges of the user viewing special crafted documents created by the attacker. New packgaes will soon be available on our ftp servers. - fetchmail Fetchmail contains remotely exploitable overflows in the mail header parsing functions. In depth discussion of these problems can be found at http://security.e-matters.de/advisories/032002.html. New packages will soon be available on our ftp servers. - kdelibs KDE's SSL implementation fails to check the trust chain in SSL certificates. This bug allows faking valid SSL certificates. New KDE packages will be available soon to fix this and other bugs. - ethereal Several potential security issues have been discovered in ethereal 0.9.4. After this package is tested succesfuly it will be relased. ______________________________________________________________________________ 3) standard appendix: authenticity verification, additional information - Package authenticity verification: SuSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. There are two verification methods that can be used independently from each other to prove the authenticity of a downloaded file or rpm package: 1) md5sums as provided in the (cryptographically signed) announcement. 2) using the internal gpg signatures of the rpm package. 1) execute the command md5sum after you downloaded the file from a SuSE ftp server or its mirrors. Then, compare the resulting md5sum with the one that is listed in the announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security@suse.de), the checksums show proof of the authenticity of the package. We disrecommend to subscribe to security lists which cause the email message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless. 2) rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig to verify the signature of the package, where is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed rpm package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SuSE in rpm packages for SuSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SuSE Linux distributions version 7.1 and thereafter install the key "build@suse.de" upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . - SuSE runs two security mailing lists to which any interested party may subscribe: suse-security@suse.com - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to . suse-security-announce@suse.com - SuSE's announce-only mailing list. Only SuSE's security announcements are sent to this list. To subscribe, send an email to . For general information or the frequently asked questions (faq) send mail to: or respectively. ===================================================================== SuSE's security contact is or . The public key is listed below. ===================================================================== ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, it is desired that the clear-text signature shows proof of the authenticity of the text. SuSE Linux AG makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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