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security advisorySuSEsyslogdRedHat: 2021:0045-2 Critical: OpenSSH Remote Exploit Vulnerability
Errors in both the klogd and the syslogd can cause both daemons do die when specially designed strings get passed to the kernel by the user.. -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: syslogd/klogd Date: Wednesday, September 20th, 2000 03:00 MEST Affected SuSE versions: 6.1 6.2, 6.3, 6.4, 7.0 Vulnerability Type: local DoS, possible root compromise Severity (1-10): 5 SuSE default package: yes Other affected systems: Linux systems, possibly unix systems Content of this advisory: 1) security vulnerability resolved: syslogd/klogd 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 syslogd package consists of two daemons that are being launched upon system startup: klogd and syslogd. The former collects kernel messages and passes them on to the syslog(3) facility. syslogd will pick up the logging messages and write them to the logfiles as specified by the syslogd configuration file /etc/syslog.conf. Errors in both the klogd and the syslogd can cause both daemons do die when specially designed strings get passed to the kernel by the user, eg. with a malformed structure in a system call. These errors have been discovered by Jouko Pynnönen, Solar Designer, a fix for one of the bugs has been provided by Daniel Jacobowitz. There is currently no known way to exploit these bugs with an effect other than a DoS (Denial of Service) of the syslog/klog service. Since it may be possible to execute arbitrary code as a result of a buffer overflow, administrators should consider applying the patches as soon as possible. Also, logging messages resulting from firewall rules in the kernel can get lost if the daemon does not pick them up. Efficient temporary countermeasures against these attacks other than package upgrade do not exist. 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 284b1975cda65cd6ed5ce65672706e19 source rpm: 49c7a171753171f4e6fd772453d46a93 SuSE-6.4 cb89ed419b0c9dbf7c66191a58606920 source rpm: 33686198aa6412401b0056241829aae0 SuSE-6.3 af5e43976fb9814e1f5d626e16c2d176 source rpm: 1e821f6fda1f471d36e9b4990aa496b4 SuSE-6.2 145f83a8b687c84c5d821db5639f2e2c source rpm: fb6800b4a5726c4d45b26e40d29af4a5 SuSE-6.1 c8d23ec6c3a9f944c15d6e12ffebc66f source rpm: b0329c20caf1d1d427da9961240732f5 SuSE-5.3 eb352b52e17db8f65ebc5ec44ff0fdb0 8a0c5626ab36581650971944f386f8c1 Sparc Platform: SuSE-7.0 38bb40e8bdfd55387f0e25407d4e5cbd source rpm: 2017cbca57305092c0a912b77c2411dd AXP Alpha Platform: SuSE-6.4 419ea3172f4532f77c4fc5907de345f2 source rpm: 44cb992c94dffff0d31b65a0938fc1cc SuSE-6.3 84cfb8fa2e471baadf96eae1d3be1d0a source rpm: 23ee4562c993de6943cead4878e73259 SuSE-6.1 3b04489436b536d3d2e4b4bec6bc5ced source rpm: ab7edad2685d8d820b0f72b470048e81 PPC Power PC Platform: SuSE-6.4 9d588d1d4614d173b60746ae74fc6046 sourcerpm: eae3b0cd9b7de4ded453e9151b722b0e ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: This is the updated list of currently known security problems. Other problems such as the one from the subject of this advisory have passed these vulnerabilities due to greater severity. - esound, xchat, gnorpm, xpdf These packages are known to exhibit file race conditions. We will provide update packages soon. - pine The pine Mail User Agent may crash when it encounters a specially crafted header line in an email. Again, we're working on a patch. ______________________________________________________________________________ 3) standard appendix: SuSE runs two security mailing lists to which any interested party may subscribe:
Sep 20, 2000
•Critical
SuSE
99
security advisorybuffer overflowcritical threatSlackware: 103001 Urgent: klogd Memory Corruption Vulnerability
A string format / buffer overflow bug has been discovered in klogd, the kernel logging daemon.. A string format / buffer overflow bug has been discovered in klogd, the kernel logging daemon. Please upgrade to the new sysklogd 1.4 package available on the Slackware FTP site. ========================================================================sysklogd 1.4 AVAILABLE - (a1/sysklogd.tgz) ======================================================================== PACKAGE INFORMATION: -------------------- a1/sysklogd.tgz: This package contains a new version of klogd (1.4) which is not vulnerable to this string format hole. Most users will have a previous version installed, and should upgrade to the new version on the FTP site. WHERE TO FIND THE NEW PACKAGES: ------------------------------- All new packages can be found in the -current branch: MD5 SIGNATURES AND CHECKSUMS: ----------------------------- Here are the md5sums and checksums for the packages: d2a7c649c19fc14e6668c583feaf62ae a1/sysklogd.tgz 4100951056 58926 a1/sysklogd.tgz INSTALLATION INSTRUCTIONS: -------------------------- The packages above should be upgraded in single user mode (runlevel 1). Bring the system into runlevel 1: # telinit 1 Then upgrade the packages: # upgradepkg .tgz Then bring the system back into multiuser mode: # telinit 3 Remember, it's also a good idea to back up configuration files before upgrading packages. - Slackware Linux Security Team The Slackware Linux Project . A critical vulnerability in the syslogd daemon has been uncovered; kindly upgrade to version 1.4 of syslogd to mitigate risks.. buffer overflow, klogd update, sysklogd package, Slackware patch. . Severity: Important. LinuxSecurity.com Team
Sep 19, 2000
•Important
Slackware
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