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Red Hat: RHSA-2000:111-04 Critical: OpenSSH Port Forwarding Risk

An OpenSSH client will do agent or X11 forwarding at the request of a server, even if the user has not requested that it be done.. ` --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Updated openssh packages available for Red Hat Linux 7 Advisory ID: RHSA-2000:111-04 Issue date: 2000-11-20 Updated on: 2000-11-27 Product: Red Hat Linux Keywords: openssh malicious server port forwarding Cross references: N/A --------------------------------------------------------------------- 1. Topic: Updated openssh packages are now available for Red Hat Linux 7. 2000-11-27: Added packages for Red Hat Linux 7 for Alpha 2. Relevant releases/architectures: Red Hat Linux 7.0 - i386, alpha 3. Problem description: An OpenSSH client will do agent or X11 forwarding at the request of a server, even if the user has not requested that it be done. A malicious server can exploit this vulnerability to gain access to the user's display. 4. Solution: For each RPM for your particular architecture, run: rpm -Fvh [filename] where filename is the name of the RPM. 5. Bug IDs fixed ( for more info): 18598 - ssh-keygen -l does not work for dsa keys 20805 - Hostile servers can force OpenSSH clients to do agent or X11 forwarding 20884 - openssh-2.3.0p1 doesn't include /etc/ssh/primes 6. RPMs required: Red Hat Linux 7.0: alpha: i386: sources: 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- d564b593cce6c1afaa02a11004ef6cf7 7.0/SRPMS/openssh-2.3.0p1-4.src.rpm cfa7b84d1389e921d11cd93888014bbe 7.0/alpha/openssh-2.3.0p1-4.alpha.rpm 59464df875127cc44ca1976db62bb977 7.0/alpha/openssh-askpass-2.3.0p1-4.alpha.rpm 957467291fc0067d70bef99c88401dcf 7.0/alpha/openssh-askpass-gnome-2.3.0p1-4.alpha.rpm da26d6a308c2c3c79f56eec077bce664 7.0/alpha/openssh-clients-2.3.0p1-4.alpha.rpm 5e4951bc163601aad8733011933d79db 7.0/alpha/openssh-server-2.3.0p1-4.alpha.rpm 973c033bd3cf3e3641f7fb9d172baf5a 7.0/i386/openssh-2.3.0p1-4.i386.rpm ead1cc84519f5a6fa0233ce8d3237457 7.0/i386/openssh-askpass-2.3.0p1-4.i386.rpm d426ff6c55181f8ccbea6e2f7a307b99 7.0/i386/openssh-askpass-gnome-2.3.0p1-4.i386.rpm 51fe082e6830e461a900000e2884cb14 7.0/i386/openssh-clients-2.3.0p1-4.i386.rpm dd9bb3271403162202599d3cd8b9a22e 7.0/i386/openssh-server-2.3.0p1-4.i386.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: You can verify each package with the following command: rpm --checksig 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 8. References: OpenBSD 2.7 Errata Copyright(c) 2000 Red Hat, Inc. `. Updated OpenSSH packages launched for Red Hat Enterprise Linux 7 to mitigate risks associated with unapproved server entry.. openssh patching, Red Hat Linux update, security fix, software update, malicious access prevention. . Severity: Critical. LinuxSecurity.com Team

Nov 27, 2000 •Critical Red Hat