-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: esound Date: Wednesday, October 11th, 2000 19:00 MEST Affected SuSE versions: 6.3, 6.4, 7.0 Vulnerability Type: local user compromise Severity (1-10): 3 SuSE default package: yes Other affected systems: Linux systems using esound with unix domain socket support Content of this advisory: 1) security vulnerability resolved: esound 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 esound, a daemon program for the Gnome desktop, is used for sound replay by various programs such as windowmanagers and other applications. The esound daemon creates a directory /tmp/.esd to host a unix domain socket. Upon startup, the daemon changes the modes of the socket, but a race condition allows an attacker to place a symlink into the directory to point to an arbitrary file belonging to the victim. By consequence, an attacker may be able to change the permissions of any file belonging to the victim. If the victim's userid is root, the attacker may be able to change the modes of any file in the system. SuSE distributions before SuSE-6.3 were not vulnerable to this attack because unix domain sockets were not supported by the esound daemon as shipped with these distributions. The only efficient solution for the problem is to store the unix domain socket in a directory where only the user has write access to. The user's home directory is such a location. Update packages that fix the race conditions by placing the sockets into the user's home directory are available for download. It is recommended to apply the fix on systems where multiple users can access the local filesystem. Note: Not all filesystems support unix domain sockets. The fix might not work if the user's home directory is on such a filesystem (such as AFS, eg.). In such rare cases, administrators are usually aware of such limitations. SuSE default installations do not have this limitation. Download the update package from locations desribed below and install the package with the command `rpm -Fhv file.rpm'. The md5sum for each file is in the line below. You can verify the integrity of the rpm files using the command `rpm --checksig --nogpg file.rpm', independently from the md5 signatures below. i386 Intel Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/snd1/esound-0.2.19-15.i386.rpm 9d8addaa5ba29554a727eb34ae5189f4 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/esound-0.2.19-15.src.rpm a9724b99a96430b1b7c1f741a8e8d528 SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/snd1/esound-0.2.16-75.i386.rpm 6f32f0867d1597a5129d0516438d9cca source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/esound-0.2.16-75.src.rpm 94ca6842981f7a501300d9edfc5cbf73 SuSE-6.3 ftp://ftp.suse.com/pub/suse/i386/update/6.3/snd1/esound-0.2.15-21.i386.rpm 16a5804a2f27e62d73df40d206b047ca source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/esound-0.2.15-21.src.rpm c86689fd5d9f719135e1263dd5a38832 Sparc Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/snd1/esound-0.2.19-15.sparc.rpm 112648ef64c351952f832b180fcca23c source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/esound-0.2.19-15.src.rpm a0bb3e3517ca83c13abd6827a8d2295e AXP Alpha Platform: SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/snd1/esound-0.2.16-75.alpha.rpm d2efefb21a6424a81e63788d972db49d source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/esound-0.2.16-75.src.rpm a69ebae320c6f118f4b9e07f2a9af4d2 SuSE-6.3 ftp://ftp.suse.com/pub/suse/axp/update/6.3/snd1/esound-0.2.15-21.alpha.rpm 19942e308eda0c0d505bb64da734ad8d source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/esound-0.2.15-21.src.rpm 6f337d6864111d27fa93ef2bc3cb7b5a PPC Power PC Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/snd1/esound-0.2.19-16.ppc.rpm be6daabfee0e7e629b848814be81d9d0 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/esound-0.2.19-16.src.rpm c77475b2c8fff104f8662bb9179efb64 SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/snd1/esound-0.2.16-75.ppc.rpm f0e1aa54c3fdf7c6c02b34bedc51ee0f source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/esound-0.2.16-75.src.rpm 9acd25b5521201386bb73bc707382646 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - gnorpm A race condition has been found in the gnorpm program, a GUI for the rpm system. The issue will be addressed in a following announcement. - ncurses The ncurses library contains buffer overflows that are exploitable when user-supplied terminfo databases are processed. This imposes a security risk on programs/binaries that are linked against libncurses and run with special privileges. Both workaround and clean solution is to remove the suid bit from all executable files with setuid bit set. The issue will be addressed in a following security announcement. - apache mod_rewrite A bug has been discovered in the apache package that allows attackers to read arbitrary files on a system that runs apache. The responsible apache module named "mod_rewrite" is not used by default on SuSE installations of the apache package. The issue will be addressed in a following security announcement. - cfengine A format string parsing bug causes the cfengine package to be vulnerable to a remote root attack. Update packages are available, the security announcement is pending. - usermode/userhelper userhelper is a suid helper program designed to let the user who is logged on to the console execute some programs with root privileges. SuSE distributions do not contain the usermode package and therefore are not vulnerable to the security problems recently discovered in the usermode package. - tmpwatch The tmpwatch packages as shipped with SuSE distributions are not vulnerable to the attacks as discussed on security forums because we ship an older version that does not provide the functionality that can be exploited. - lprNG The versions of the lprNG package that come with SuSE distributions are not vulnerable to the format string parsing errors as discussed in security forums. - traceroute The traceroute program has been found vulnerable to a bug (`traceroute -g 1 -g 1') in many distributions. Newer SuSE distributions have a different implementation of the traceroute program and are not vulnerable to the bug found by Pekka Savola . The vulnerability could not be verified in older SuSE distributions. ______________________________________________________________________________ 3) standard appendix: 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 annoucements 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 . =============================================== Regards, Roman Drahtmüller. - - -- - - | Roman Drahtmüller // "Caution: Cape does | SuSE GmbH - Security Phone: // not enable user to fly." | Nürnberg, Germany +49-911-740530 // (Batman Costume warning label) | - - ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. SuSE GmbH makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. Type Bits/KeyID Date User ID pub 2048/3D25D3D9 1999/03/06 SuSE Security Team - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.3i mQENAzbhLQQAAAEIAKAkXHe0lWRBXLpn38hMHy03F0I4Sszmoc8aaKJrhfhyMlOA BqvklPLE2f9UrI4Xc860gH79ZREwAgPt0pi6+SleNFLNcNFAuuHMLQOOsaMFatbz JR9i4m/lf6q929YROu5zB48rBAlcfTm+IBbijaEdnqpwGib45wE/Cfy6FAttBHQh 1Kp+r/jPbf1mYAvljUfHKuvbg8t2EIQz/5yGp+n5trn9pElfQO2cRBq8LFpf1l+U P7EKjFmlOq+Gs/fF98/dP3DfniSd78LQPq5vp8RL8nr/o2i7jkAQ33m4f1wOBWd+ cZovrKXYlXiR+Bf7m2hpZo+/sAzhd7LmAD0l09kABRG0JVN1U0UgU2VjdXJpdHkg VGVhbSA8c2VjdXJpdHlAc3VzZS5kZT6JARUDBRA24S1H5Fiyh7HKPEUBAVcOB/9b yHYji1/+4Xc2GhvXK0FSJN0MGgeXgW47yxDL7gmR4mNgjlIOUHZj0PEpVjWepOJ7 tQS3L9oP6cpj1Fj/XxuLbkp5VCQ61hpt54coQAvYrnT9rtWEGN+xmwejT1WmYmDJ xG+EGBXKr+XP69oIUl1E2JO3rXeklulgjqRKos4cdXKgyjWZ7CP9V9daRXDtje63 Om8gwSdU/nCvhdRIWp/Vwbf7Ia8iZr9OJ5YuQl0DBG4qmGDDrvImgPAFkYFzwlqo choXFQ9y0YVCV41DnR+GYhwl2qBd81T8aXhihEGPIgaw3g8gd8B5o6mPVgl+nJqI BkEYGBusiag2pS6qwznZiQEVAwUQNuEtBHey5gA9JdPZAQFtOAf+KVh939b0J94u v/kpg4xs1LthlhquhbHcKNoVTNspugiC3qMPyvSX4XcBr2PC0cVkS4Z9PY9iCfT+ x9WM96g39dAF+le2CCx7XISk9XXJ4ApEy5g4AuK7NYgAJd39PPbERgWnxjxir9g0 Ix30dS30bW39D+3NPU5Ho9TD/B7UDFvYT5AWHl3MGwo3a1RhTs6sfgL7yQ3U+mvq MkTExZb5mfN1FeaYKMopoI4VpzNVeGxQWIz67VjJHVyUlF20ekOz4kWVgsxkc8G2 saqZd6yv2EwqYTi8BDAduweP33KrQc4KDDommQNDOXxaKOeCoESIdM4p7Esdjq1o L0oixF12Cg== =pIeS - -----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv iQEVAwUBOeSeQHey5gA9JdPZAQHrvQf/Rr4f0JNuNIRymhcGou60OfvkDjXOH2yi iT/CG9+uQns6QCyNe4jFjMNoFjCt//eZG2zMOO/22RiiCXUbPKeLPXVgyZYDN5VS F1JDJfxYIoHrU+eQnDO1QVM0QpXbeSU4J6YIXxneZaZ0uP2kqi6y0o36UQtwzk3j tRY/H1NsNWcKPYYTYWgmKZUQNd5n+Jq3cSf8DQAPWzoRoLGPo1+yp/SGuOyZbKN/ mEwTcsFxdOGgHtBOcHfRaAcb4nBHQ9QApKZTan8ndLTUIrhFb9C06gh9BEGmaqLD jENF4MnWIlxGX5EaW0nLSJ2Ts4uh8julg9qteJGLN949+2ECfgzqag== =oZfu -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: suse-security-announce-unsubscribe@suse.com For additional commands, e-mail: suse-security-announce-help@suse.com