Jay, There was a recent vulnerability discovered in RedHat's OpenSSH. I have included the RH notice on the fix. --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: Updated OpenSSH packages available Advisory ID: RHSA-2001:161-08 Issue date: 2001-12-03 Updated on: 2001-12-04 Product: Red Hat Linux Keywords: openssh uselogin Cross references: Obsoletes: RHSA-2001:154 --------------------------------------------------------------------- 1. Topic: Updated OpenSSH packages are now available for Red Hat Linux 7, 7.1, and 7.2. These packages fix a vulnerability which exists when a server is configured with the "UseLogin" option. 2. Relevant releases/architectures: Red Hat Linux 7.0 - alpha, i386 Red Hat Linux 7.1 - alpha, i386, ia64 Red Hat Linux 7.2 - i386 3. Problem description: When the "UseLogin" option is enabled in OpenSSH, a malicious user who authenticates using key-based authentication methods can influence the environment variables passed to the login process. This could allow the user to execute arbitrary code with superuser privileges. In Red Hat Linux the OpenSSH server has the "UseLogin" option disabled by default. Therefore, it is not vulnerable unless the system administrator has changed this setting. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2001-0872 to this issue. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 6. RPMs required: Red Hat Linux 7.0: SRPMS: ftp://updates.redhat.com/7.0/en/os/SRPMS/openssh-2.9p2-11.7.src.rpm alpha: ftp://updates.redhat.com/7.0/en/os/alpha/openssh-2.9p2-11.7.alpha.rpm ftp://updates.redhat.com/7.0/en/os/alpha/openssh-clients-2.9p2-11.7.alpha.rp m ftp://updates.redhat.com/7.0/en/os/alpha/openssh-server-2.9p2-11.7.alpha.rpm ftp://updates.redhat.com/7.0/en/os/alpha/openssh-askpass-2.9p2-11.7.alpha.rp m ftp://updates.redhat.com/7.0/en/os/alpha/openssh-askpass-gnome-2.9p2-11.7.al pha.rpm i386: ftp://updates.redhat.com/7.0/en/os/i386/openssh-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.0/en/os/i386/openssh-clients-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.0/en/os/i386/openssh-server-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.0/en/os/i386/openssh-askpass-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.0/en/os/i386/openssh-askpass-gnome-2.9p2-11.7.i38 6.rpm Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/openssh-2.9p2-11.7.src.rpm alpha: ftp://updates.redhat.com/7.1/en/os/alpha/openssh-2.9p2-11.7.alpha.rpm ftp://updates.redhat.com/7.1/en/os/alpha/openssh-clients-2.9p2-11.7.alpha.rp m ftp://updates.redhat.com/7.1/en/os/alpha/openssh-server-2.9p2-11.7.alpha.rpm ftp://updates.redhat.com/7.1/en/os/alpha/openssh-askpass-2.9p2-11.7.alpha.rp m ftp://updates.redhat.com/7.1/en/os/alpha/openssh-askpass-gnome-2.9p2-11.7.al pha.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/openssh-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.1/en/os/i386/openssh-clients-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.1/en/os/i386/openssh-server-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.1/en/os/i386/openssh-askpass-2.9p2-11.7.i386.rpm ftp://updates.redhat.com/7.1/en/os/i386/openssh-askpass-gnome-2.9p2-11.7.i38 6.rpm ia64: ftp://updates.redhat.com/7.1/en/os/ia64/openssh-2.9p2-11.7.ia64.rpm ftp://updates.redhat.com/7.1/en/os/ia64/openssh-clients-2.9p2-11.7.ia64.rpm ftp://updates.redhat.com/7.1/en/os/ia64/openssh-server-2.9p2-11.7.ia64.rpm ftp://updates.redhat.com/7.1/en/os/ia64/openssh-askpass-2.9p2-11.7.ia64.rpm ftp://updates.redhat.com/7.1/en/os/ia64/openssh-askpass-gnome-2.9p2-11.7.ia6 4.rpm Red Hat Linux 7.2: SRPMS: ftp://updates.redhat.com/7.2/en/os/SRPMS/openssh-2.9p2-12.src.rpm i386: ftp://updates.redhat.com/7.2/en/os/i386/openssh-2.9p2-12.i386.rpm ftp://updates.redhat.com/7.2/en/os/i386/openssh-clients-2.9p2-12.i386.rpm ftp://updates.redhat.com/7.2/en/os/i386/openssh-server-2.9p2-12.i386.rpm ftp://updates.redhat.com/7.2/en/os/i386/openssh-askpass-2.9p2-12.i386.rpm ftp://updates.redhat.com/7.2/en/os/i386/openssh-askpass-gnome-2.9p2-12.i386. rpm 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- a404df85b0bd8ee13544f27d8bc80e41 7.0/en/os/SRPMS/openssh-2.9p2-11.7.src.rpm 9edc7fc8d4db042c391c9b569f06bbc6 7.0/en/os/alpha/openssh-2.9p2-11.7.alpha.rpm e568631c7a7e0d4b73fe27053398cbe3 7.0/en/os/alpha/openssh-askpass-2.9p2-11.7.alpha.rpm aa9fe70df6ea2fabdc7bcbb6ee18f77e 7.0/en/os/alpha/openssh-askpass-gnome-2.9p2-11.7.alpha.rpm d6c8d8b029358c1035d063688ee9a29f 7.0/en/os/alpha/openssh-clients-2.9p2-11.7.alpha.rpm a729bd387061f3fa437dfb7bcc44fc47 7.0/en/os/alpha/openssh-server-2.9p2-11.7.alpha.rpm 9032ed606510cb0647015ec25bcb8a65 7.0/en/os/i386/openssh-2.9p2-11.7.i386.rpm 388f0ab300dd833c565381a161a2d469 7.0/en/os/i386/openssh-askpass-2.9p2-11.7.i386.rpm 142f92df28c2ec27eafb56313190927e 7.0/en/os/i386/openssh-askpass-gnome-2.9p2-11.7.i386.rpm a8e73953e02df3277479a45c89284ad6 7.0/en/os/i386/openssh-clients-2.9p2-11.7.i386.rpm 6b87c6cb013cd3303432f1bf45326735 7.0/en/os/i386/openssh-server-2.9p2-11.7.i386.rpm a404df85b0bd8ee13544f27d8bc80e41 7.1/en/os/SRPMS/openssh-2.9p2-11.7.src.rpm 9edc7fc8d4db042c391c9b569f06bbc6 7.1/en/os/alpha/openssh-2.9p2-11.7.alpha.rpm e568631c7a7e0d4b73fe27053398cbe3 7.1/en/os/alpha/openssh-askpass-2.9p2-11.7.alpha.rpm aa9fe70df6ea2fabdc7bcbb6ee18f77e 7.1/en/os/alpha/openssh-askpass-gnome-2.9p2-11.7.alpha.rpm d6c8d8b029358c1035d063688ee9a29f 7.1/en/os/alpha/openssh-clients-2.9p2-11.7.alpha.rpm a729bd387061f3fa437dfb7bcc44fc47 7.1/en/os/alpha/openssh-server-2.9p2-11.7.alpha.rpm 9032ed606510cb0647015ec25bcb8a65 7.1/en/os/i386/openssh-2.9p2-11.7.i386.rpm 388f0ab300dd833c565381a161a2d469 7.1/en/os/i386/openssh-askpass-2.9p2-11.7.i386.rpm 142f92df28c2ec27eafb56313190927e 7.1/en/os/i386/openssh-askpass-gnome-2.9p2-11.7.i386.rpm a8e73953e02df3277479a45c89284ad6 7.1/en/os/i386/openssh-clients-2.9p2-11.7.i386.rpm 6b87c6cb013cd3303432f1bf45326735 7.1/en/os/i386/openssh-server-2.9p2-11.7.i386.rpm 093fff2a546589e129afdf984b419173 7.1/en/os/ia64/openssh-2.9p2-11.7.ia64.rpm a3531573d0dbe68ed548cff3f5de023c 7.1/en/os/ia64/openssh-askpass-2.9p2-11.7.ia64.rpm 8cc6096f248bb13ef9eec2b31a71ccc7 7.1/en/os/ia64/openssh-askpass-gnome-2.9p2-11.7.ia64.rpm e842d4ba17ec0889e54730ad33e722e5 7.1/en/os/ia64/openssh-clients-2.9p2-11.7.ia64.rpm b8c3f281c2c7be14f71994d20205723b 7.1/en/os/ia64/openssh-server-2.9p2-11.7.ia64.rpm 5f12c077bf40570dac9b950d83f1e960 7.2/en/os/SRPMS/openssh-2.9p2-12.src.rpm 1a11b675b6af99f9edffeef639825916 7.2/en/os/i386/openssh-2.9p2-12.i386.rpm 850879609a667619c7e952fadca3063c 7.2/en/os/i386/openssh-askpass-2.9p2-12.i386.rpm 99620e435ce9d69c851e10695828eb80 7.2/en/os/i386/openssh-askpass-gnome-2.9p2-12.i386.rpm ff3f8671339645ccbdfa65a03e4b4d09 7.2/en/os/i386/openssh-clients-2.9p2-12.i386.rpm 199895daa920eac36c2567ced3c70e9b 7.2/en/os/i386/openssh-server-2.9p2-12.i386.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/about/contact/pgpkey.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> 8. References: http://marc.theaimsgroup.com/?l=openssh-unix-dev&m=100747128105913 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0872 Copyright(c) 2000, 2001 Red Hat, Inc. --------------------------------------------------------------- Eric Schroeder /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Network Engineer West Group, NAG PH: 651.848.2868 E1-N113 Eric.Schroederat_private /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ -----Original Message----- From: Jay D. Dyson [mailto:jdysonat_private] Sent: Monday, December 10, 2001 11:31 AM To: Incidents List Cc: Neil Dickey Subject: Re: Voluminous SSHd scanning; possible worm activity? -----BEGIN PGP SIGNED MESSAGE----- On Mon, 10 Dec 2001, Neil Dickey wrote: > > I've been seeing a lot of SSHd scans of late. > [ ... ] > > Has anyone else seen this sort of thing from their systems? > > Until a month or two ago we *never* saw scans to port 22. Now they are > common, though I'm not seeing anything like the intensity you describe. > In a week I might see as many as six, total, and that would be a heavy > week for me. Right now, the scans I'm seeing are coming in at around six in a day. Started four days ago. > Most of what I detect appear to be SYN scans. Has anyone done a > honeypot study to find out what weaknesses are being exploited, or is it > just the usual bug in SSH1? Perhaps we should touch base with the HoneyNet crew and see what they've discovered? - -Jay ( ( _______ )) )) .-"There's always time for a good cup of coffee"-. >====<--. C|~~|C|~~| (>----- Jay D. Dyson -- jdysonat_private -----<) | = |-' `--' `--' `---------- Si vis pacem, para bellum. ----------' `------' -----BEGIN PGP SIGNATURE----- Version: 2.6.2 Comment: See http://www.treachery.net/~jdyson/ for current keys. iQCVAwUBPBTjS7lDRyqRQ2a9AQHNPgQAlvrQgvUHEYYOfJeIfSj7mG4fKSfQjpaC eClyziq6jyziKpBecokq6jbSk9bP2K+ywZRf2oYXDDnU7ufnBjQuGIBxFNehu6VA 1//K57kbk5MCuquOnwZHAdf3VwLoOadW4CDdZffNIBwom9pXo+FzIHnZTLjfNK+g CVVlZJNbSN8= =cRfx -----END PGP SIGNATURE----- ---------------------------------------------------------------------------- This list is provided by the SecurityFocus ARIS analyzer service. 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This archive was generated by hypermail 2b30 : Mon Dec 10 2001 - 12:36:10 PST