--------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Denial of service attack in syslogd Advisory ID: RHSA-1999:055-01 Issue date: 1999-11-19 Updated on: 1999-11-19 Keywords: syslogd sysklogd stream socket Cross references: bugtraq id #809 --------------------------------------------------------------------- 1. Topic: A denial of service attack exists in the system log daemon, syslogd. 2. Relevant releases/architectures: Red Hat Linux 4.x, all architectures Red Hat Linux 5.x, all architectures Red Hat Linux 6.0, all architectures Red Hat Linux 6.1 is not vulnerable to this security issue. However, users of Red Hat Linux 6.1/Intel may wish to upgrade to the latest package to fix a problem in the syslog daemon where log connections would be reset after the syslog daemon is restarted. 3. Problem description: The syslog daemon by default used unix domain stream sockets for receiving local log connections. By opening a large number of connections to the log daemon, the user could make the system unresponsive. Thanks go to Olaf Kirch (okirat_private) for noting the vulnerability and providing patches. 4. Solution: For each RPM for your particular architecture, run: rpm -Uvh <filename> where filename is the name of the RPM. libc updates are needed for Red Hat Linux 4.2 for the Intel and Sparc architectures so that logging will work correctly with the upgraded sysklogd packages. Note: Upgrading to these sysklogd packages may impair the logging abilities of some software that does not use the standard C library syslog(3) interface to the system logs. Such software may have to be changed to use datagram connections instead of stream connections to the log socket. 5. Bug IDs fixed (http://developer.redhat.com/bugzilla for more info): 6. Obsoleted by: 7. Conflicts with: 8. RPMs required: Red Hat Linux 4.x: Intel: ftp://updates.redhat.com/4.2/i386/sysklogd-1.3.31-0.5.i386.rpm ftp://updates.redhat.com/4.2/i386/libc-5.3.12-18.5.i386.rpm ftp://updates.redhat.com/4.2/i386/libc-debug-5.3.12-18.5.i386.rpm ftp://updates.redhat.com/4.2/i386/libc-devel-5.3.12-18.5.i386.rpm ftp://updates.redhat.com/4.2/i386/libc-profile-5.3.12-18.5.i386.rpm ftp://updates.redhat.com/4.2/i386/libc-static-5.3.12-18.5.i386.rpm Alpha: ftp://updates.redhat.com/4.2/alpha/sysklogd-1.3.31-0.5.alpha.rpm Sparc: ftp://updates.redhat.com/4.2/sparc/sysklogd-1.3.31-0.5.sparc.rpm ftp://updates.redhat.com/4.2/sparc/libc-5.3.12-18.5.sparc.rpm ftp://updates.redhat.com/4.2/sparc/libc-debug-5.3.12-18.5.sparc.rpm ftp://updates.redhat.com/4.2/sparc/libc-devel-5.3.12-18.5.sparc.rpm ftp://updates.redhat.com/4.2/sparc/libc-profile-5.3.12-18.5.sparc.rpm ftp://updates.redhat.com/4.2/sparc/libc-static-5.3.12-18.5.sparc.rpm Source packages: ftp://updates.redhat.com/4.2/SRPMS/sysklogd-1.3.31-0.5.src.rpm ftp://updates.redhat.com/4.2/SRPMS/libc-5.3.12-18.5.src.rpm Red Hat Linux 5.x: Intel: ftp://updates.redhat.com/5.2/i386/sysklogd-1.3.31-1.5.i386.rpm Alpha: ftp://updates.redhat.com/5.2/alpha/sysklogd-1.3.31-1.5.alpha.rpm Sparc: ftp://updates.redhat.com/5.2/sparc/sysklogd-1.3.31-1.5.sparc.rpm Source packages: ftp://updates.redhat.com/5.2/SRPMS/sysklogd-1.3.31-1.5.src.rpm Red Hat Linux 6.0: Intel: ftp://updates.redhat.com/6.0/i386/sysklogd-1.3.31-14.i386.rpm Alpha: ftp://updates.redhat.com/6.0/alpha/sysklogd-1.3.31-14.alpha.rpm Sparc: ftp://updates.redhat.com/6.0/sparc/sysklogd-1.3.31-14.sparc.rpm Source packages: ftp://updates.redhat.com/6.0/SRPMS/sysklogd-1.3.31-14.src.rpm Red Hat Linux 6.1: Intel: ftp://updates.redhat.com/6.1/i386/sysklogd-1.3.31-14.i386.rpm Source packages: ftp://updates.redhat.com/6.1/SRPMS/sysklogd-1.3.31-14.src.rpm 9. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 378d0be4ef864e9106fe46349cb366b9 i386/sysklogd-1.3.31-0.5.i386.rpm 801c745d3e920d29fdea2f5be07d25b3 i386/libc-5.3.12-18.5.i386.rpm 1d5ba779311e222a824895e0a6b34516 i386/libc-debug-5.3.12-18.5.i386.rpm bacf136ee00f323fcf0a8db95b5ab231 i386/libc-devel-5.3.12-18.5.i386.rpm a25eb15726a1c216b3bdf9ab1b2d670c i386/libc-profile-5.3.12-18.5.i386.rpm 62bc3f2df09cdc0abd4138b51894b6a7 i386/libc-static-5.3.12-18.5.i386.rpm bafdc46464b2ae72739630c14e2eeb5a alpha/sysklogd-1.3.31-0.5.alpha.rpm f34994e1cd262f01dc5c11681a31855e sparc/sysklogd-1.3.31-0.5.sparc.rpm 7130a7c76581cde28790638e6696d522 sparc/libc-5.3.12-18.5.sparc.rpm f81bae231d268bd1a1a703f13fb4c140 sparc/libc-debug-5.3.12-18.5.sparc.rpm 0938e6fb074dd0769542037194ccb031 sparc/libc-devel-5.3.12-18.5.sparc.rpm bceef7f99adc7b198f743eacd770db5b sparc/libc-profile-5.3.12-18.5.sparc.rpm ef2d6ecb52d6ef30fac839e3a0c4e7d0 sparc/libc-static-5.3.12-18.5.sparc.rpm d371c2f33b29034be986b95f3acf457f SRPMS/sysklogd-1.3.31-0.5.src.rpm 1c210bd05b6de76ee8ac8d6c40c3d1d9 SRPMS/libc-5.3.12-18.5.src.rpm 1cd398b77471d5a90c2ce64487c32be4 i386/sysklogd-1.3.31-1.5.i386.rpm 2564ea2b333d6c26024f8edefb49f295 alpha/sysklogd-1.3.31-1.5.alpha.rpm 5561ccefc3e499dba6b5eae181dde217 sparc/sysklogd-1.3.31-1.5.sparc.rpm 508762e8fd7e97c5c50372eb27eaa19c SRPMS/sysklogd-1.3.31-1.5.src.rpm 8e59b61b8b1a9356ea675d7234b801d8 i386/sysklogd-1.3.31-14.i386.rpm d906f40e4084ac82afe9b5a2686a167d alpha/sysklogd-1.3.31-14.alpha.rpm 5ec7b94032e4c3a911099d7547e0742d sparc/sysklogd-1.3.31-14.sparc.rpm 55cc22adb6b3272ef23763e89309af24 SRPMS/sysklogd-1.3.31-14.src.rpm 8e59b61b8b1a9356ea675d7234b801d8 i386/sysklogd-1.3.31-14.i386.rpm 55cc22adb6b3272ef23763e89309af24 SRPMS/sysklogd-1.3.31-14.src.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/corp/contact.html You can verify each package with the following command: rpm --checksig <filename> If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: rpm --checksig --nogpg <filename> 10. References:
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