8800897 2002-08-01 13:52 +0200 /355 rader/ Thomas Biege <thomas@suse.de> Sänt av: joel@lysator.liu.se Importerad: 2002-08-01 18:50 av Brevbäraren Extern mottagare: linux-alert@cert.dfn.de Mottagare: Bugtraq (import) <23436> Ärende: SuSE Security Announcement: wwwoffle (SuSE-SA:2002:029) ------------------------------------------------------------ From: Thomas Biege <thomas@suse.de> To: <linux-alert@cert.dfn.de> Message-ID: <Pine.LNX.4.33.0208011351210.18993-100000@wotan.suse.de> -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: wwwoffle Announcement-ID: SuSE-SA:2002:029 Date: Thursday, Aug 1st 2002 12:30 MEST Affected products: 7.1, 7.2, 7.3, 8.0 Vulnerability Type: remote privilege escalation Severity (1-10): 4 SuSE default package: no Other affected systems: all systems using wwwoffle Content of this advisory: 1) security vulnerability resolved: insufficient checking of Content Length value problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The WWWOFFLE, World Wide Web Offline Explorer, program suite acts as a HTTP, FTP and Finger proxy to allow users with dial-up access to the internet to do offline WWW browsing. The parsing code of wwwoffled that processes HTTP PUT and POST requests fails to handle a Content Length value smaller then -1. It is believed that an attacker could exploit this bug to gain remote wwwrun access to the system wwwoffled is running on. The wwwoffle package is not installed by default. As temporary workaround the wwwoffle daemon can be disabled the following way (as root): rcwwwoffle stop If wwwoffled is started at boottime, you have to modify your boot scripts too. This can be done by using the runlevel editor of yast2. All running instances of wwwoffled need to be restarted after updating your system (as root): rcwwwoffle restart 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. Missing packages will be published as soon as possible. i386 Intel Platform: SuSE-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/wwwoffle-2.6d-300.i386.patch.rpm 841aed6738e45973891a08e8c666a624 SuSE-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/wwwoffle-2.6d-300.i386.rpm de8e402d077da779070e3e1158b1463f source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/wwwoffle-2.6d-300.src.rpm cb35aca6bfd20360883beb025647fabe SuSE-7.3 ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/wwwoffle-2.6d-298.i386.rpm 08438c130e574eb2f3c9b7c8cc60f45b source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/wwwoffle-2.6d-298.src.rpm 1a48eda5d2b8032aef96c62cf2472cd1 SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/wwwoffle-2.6b-63.i386.rpm 54ad9710b00030e5402478958545ad73 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/wwwoffle-2.6b-63.src.rpm 89705ac7a6ce27e8fb8198aef626315a SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/wwwoffle-2.6-20.i386.rpm 345aeaf33ed09e22cd0d5e2ea9202fef source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/wwwoffle-2.6-20.src.rpm 1c6a427d71b338a9c0091c4dc5ea1e61 Sparc Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/wwwoffle-2.6-18.sparc.rpm b525c495f7e47f64cfbe1c364b683d90 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/wwwoffle-2.6-18.src.rpm ae9df7749fc38b0a7be2d013eeb5f8fb AXP Alpha Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/wwwoffle-2.6-26.alpha.rpm 0140df0cf370942f50c9a6af2167b4bc source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/wwwoffle-2.6-26.src.rpm e2d72c3e70ef7e083fcd34a788cf1638 PPC Power PC Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/wwwoffle-2.6d-207.ppc.rpm 98bfb93df81b987a93ba5ce8578325c2 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/wwwoffle-2.6d-207.src.rpm f8816a3a536a60b72839fe010b8aceeb SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/wwwoffle-2.6-24.ppc.rpm 4a5f2eb327fa5441a7e9d0f9d0af32f5 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/wwwoffle-2.6-24.src.rpm 5a31460401e823a4adc17eda39222c1f ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - bzip The FreeBSD Team discovered some security related bugs in bzip2. By exploiting this bugs an attacker could change file permissions or overwrite files. Bzip got fixed and a new version of the bzip package is available on our FTP servers. - pam_ldap A "format string" bug in pam_ldap's logging functions gots fixed. New packages are available on our FTP servers. - chfn/util-linux Linux distributors have published security announcements about password locking race conditions that lead to a local root vulnerability. SuSE products are not affected by this weakness because we use the user/group management utilities from the shadow package. These utilities are not affected. - libpng libpng is a library that provides functions for applications to handle PNG image files (Portable Network Graphics). An overflow vulnerability has been found in the libpng library that may make it possible for an attacker to run arbitrary code or to crash an application that uses the libpng library if the application in question opens a png image file. We are in the process of fixing this vulnerability. ______________________________________________________________________________ 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 <name-of-the-file.rpm> 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 <file.rpm> to verify the signature of the package, where <file.rpm> 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-subscribe@suse.com>. 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 <suse-security-announce-subscribe@suse.com>. For general information or the frequently asked questions (faq) send mail to: <suse-security-info@suse.com> or <suse-security-faq@suse.com> respectively. ===================================================================== SuSE's security contact is <security@suse.com> or <security@suse.de>. The <security@suse.de> 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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-----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3in Charset: noconv iQEVAwUBPUkbbHey5gA9JdPZAQHQjAf/T/8kVNSdI3w4YRHUqNmTNH/0YUYJTe+G 5zIgkRvsFG1KYBGLlX9D13eeCC0oeDq3A8MngEW5U9LDYYWoUKhYgmJeWMOarwA2 JnqqdFPduaYOlnLZkZSw94kQiBxqU6gF3Qq0NfRrjVMk1JuvwiyFw8nr3fwmPeBY izvpWAhbr3RQvhoCdUigRNCAfTBuQL1WVI3RT15Vrh9WA7sR+1t2FIor4fx2cBCq mRbRWk+qTl2lS3afrjADinNZWIoStE3MNflzUOLB5xsogzsDRcNsOI+dyebBSRqC WTAYE5Lr7QbTYuTUf8425ot1QeoHn1ThrhC9KbzVz8ceHf1MHXScvw== =RSY0 -----END PGP SIGNATURE----- Bye, Thomas -- Thomas Biege <thomas@suse.de> SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg Function: Security Support & Auditing "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka" Key fingerprint = 51 AD B9 C7 34 FC F2 54 01 4A 1C D4 66 64 09 83 -- Trete durch die Form ein, und trete aus der Form heraus. (8800897) /Thomas Biege <thomas@suse.de>/-(Ombruten)