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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.025 -- FreeBSD-SA-01:02 syslog-ng remote denial-of-service 17 January 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: syslog-ng Vendor: FreeBSD Ports Collection Operating System: FreeBSD BSD Impact: Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-01:02 Security Advisory FreeBSD, Inc. Topic: syslog-ng remote denial-of-service Category: ports Module: syslog-ng Announced: 2001-01-15 Credits: Balazs Scheidler <bazsi@BALABIT.HU> Affects: Ports collection prior to the correction date. Corrected: 2000-11-25 Vendor status: Updated version released FreeBSD only: NO I. Background syslog-ng is a replacement for the standard syslogd daemon, a service for logging of local and remote system messages. II. Problem Description The syslog-ng port, versions prior to 1.4.9, contains a remote vulnerability. Due to incorrect log parsing, remote users may cause syslog-ng to crash, causing a denial-of-service if the daemon is not running under a watchdog process which will automatically restart it in the event of failure. The syslog-ng port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains nearly 4500 third-party applications in a ready-to-install format. The ports collections shipped with FreeBSD 3.5.1 and 4.2 contain this problem since it was discovered after the releases. FreeBSD makes no claim about the security of these third-party applications, although an effort is underway to provide a security audit of the most security-critical ports. III. Impact Malicious remote attackers may cause syslog-ng to crash, causing a denial-of-service if the daemon is not running under a watchdog process which will automatically restart it in the event of failure. The default installation of the port/package is therefore vulnerable to this problem. If you have not chosen to install the syslog-ng port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the syslog-ng port/package, if you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the syslog-ng port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/sysutils/syslog-ng-1.4.10.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/sysutils/syslog-ng-1.4.10.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/sysutils/syslog-ng-1.4.10.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/sysutils/syslog-ng-1.4.10.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/sysutils/syslog-ng-1.4.10.tgz 3) download a new port skeleton for the syslog-ng port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (FreeBSD) Comment: For info see http://www.gnupg.org iQCVAwUBOmN6R1UuHi5z0oilAQGfWgP/Yd6fjKCernj84HSuHgdXCxT3g27VFub6 9k62GJ1wiwz8S3v4zvx1C1xbhE+pgBv+EuBe8SEp0R2BtKC/RdcrWAwYtxvqA/6d yknNjwBSJ2yvkZMzeG2pZXsy6TG8n6lIiEp0aCWqOsSn5FgykXg1YfAXiJ1Mo0Gu aNKBcOEMCag= =0IjM - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: email@example.com Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBOm/y2Ch9+71yA2DNAQGj2AQAne58JmGVEoOAmlAs6q/x5CwUYM26CzzZ p1zRL9RV0wPo+SNVgBlbSt5D1QbGgIubHIB93VS+UbiqDCeUsCOdcJ//SAogXBCO bNnrBXr++JfI/z5RxQ1yeubiIuT8N+VOjd/rrX3+XiALUKL7tBtqfF1o9WDJnn2m Wpj6ajzv1iI= =Swi+ -----END PGP SIGNATURE-----