6359982 2001-04-12 14:03 -0500 /183 rader/ Progeny Security Team <security@PROGENY.COM> Sänt av: joel@lysator.liu.se Importerad: 2001-04-13 10:23 av Brevbäraren Extern mottagare: BUGTRAQ@SECURITYFOCUS.COM Externa svar till: security@PROGENY.COM Mottagare: Bugtraq (import) <16517> Ärende: PROGENY-SA-2001-04: OpenSSH subject to traffic analysis ------------------------------------------------------------ From: Progeny Security Team <security@PROGENY.COM> To: BUGTRAQ@SECURITYFOCUS.COM Message-ID: <20010412190353.727D714109@albus.indy.progeny.com> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 --------------------------------------------------------------------------- PROGENY LINUX SYSTEMS -- SECURITY ADVISORY PROGENY-SA-2001-04 --------------------------------------------------------------------------- Topic: OpenSSH subject to traffic analysis Category: net Module: openssh Announced: 2001-04-12 Credits: Solar Designer <solar@openwall.com> BugTraq Mailing List <bugtraq@securityfocus.com> Affects: Progeny Debian (openssh prior to 2.5.2p2-0progeny1) Debian GNU/Linux (openssh prior to 2.5.2) Vendor-Status: New Version Released (openssh_2.5.2p2-0progeny1) Corrected: 2001-04-12 Progeny Only: NO $Id: PROGENY-SA-2001-04,v 1.8 2001/04/12 18:02:02 jdaily Exp $ --------------------------------------------------------------------------- SYNOPSIS A number of security problems existed in previous versions of OpenSSH which would allow an attacker obtain sensitive information by passively monitoring the encrypted SSH (Secure Shell) sessions. PROBLEM DESCRIPTION Solar Designer has conducted a very thorough analysis of several weaknesses in implementations of the SSH protocol. These weaknesses allow for an attacker to significantly speed up brute force attacks on passwords. Solar Designer's complete analysis can be found at the following page: http://www.openwall.com/advisories/OW-003-ssh-traffic-analysis.txt In February of 2001, Core SDI released a security announcement which described ways in which would allow an attacker to compromise the session of an SSH protocol 1.5 session. The detailed report is at the following URL: http://www.core-sdi.com/advisories/ssh1_sessionkey_recovery.htm IMPACT Shortcomings in the OpenSSH implementation of the SSH protocol allow malicious third parties to compromise sensitive data. SOLUTION Upgrade to a fixed version of OpenSSH. You may use Progeny's OpenSSH package, version openssh_2.5.2p2-0progeny1, for convenience. WORKAROUND There is no known satisfactory work around at this time. UPDATING VIA APT-GET 1. Ensure that your /etc/apt/sources.list file has a URI for Progeny's security update repository: deb http://archive.progeny.com/progeny updates/newton/ 2. Update your cache of available packages for apt(8). Example: # apt-get update 3. Using apt(8), install the new ssh package. apt(8) will download the update, verify it's integrity with md5, and then install the package on your system with dpkg(8). Example: # apt-get install ssh UPDATING VIA DPKG 1. Using your preferred FTP/HTTP client to retrieve the following updated files from Progeny's update archive at: http://archive.progeny.com/pub/progeny/updates/newton/ Filename MD5 Checksum ------------------------------------ -------------------------------- ssh_2.5.2p2-0progeny1_i386.deb c64fdf411514850f3854a6395c5e178c Example: # wget http://archive.progeny.com/progeny/updates/newton/ssh_2.5.2p2-0progeny1_i386.deb 2. Use the md5sum command on the retrieved file to verify that it matches the md5sum provided in this advisory: Example: # md5sum ssh_2.5.2p2-0progeny1_i386.deb 3. Then install the replacement package(s) using the dpkg command. Example: # dpkg --install ssh_2.5.2p2-0progeny1_i386.deb MORE INFORMATION There is no more information available at this time. --------------------------------------------------------------------------- pub 1024D/F92D4D1F 2001-04-04 Progeny Security Team <security@progeny.com> - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.4 (GNU/Linux) Comment: For info see http://www.gnupg.org mQGiBDrKpVkRBACS4/hjUliUt9UGTHMUGSZpQlKfBk9OFHmyLHTdjyIBCWRMmOBn RRhag0FgPicVIDndoQvYw3+ESC/RtbuPCBf6DZ7S0+NHhm1SHEbZyHFLkRXJm+IS 29oFmKrfXnXHckCrJFDZbOznRF6dVe7hV8CYi3FtoTjlRbuiHPQCMuy4ewCghAfv eYxfB25AoTdBT7WiG8jd4w8D/iFweuqzTwcWtXEgDbDd21W9hNPLEELgguimCCdP l3GHqw/MUJpIvdYfYhCzTaf4VpvkM5xlJGAcelCUL9qAufwyU8U8JI2YzlbqSlO8 qRwaiwq9qisTKEBb3IQadFqug+ihVdUeP8cuXPvbUEbFt7ILWyUD/kntgFdf1Apo zZWlA/0SM45hV6yomcM7z08tyh4hZTrWX/RUJqe+U1niNAmzPg4P+r8SfXdIkjb2 fZT5h5cYLIiK+kUEkqyPmZwUlgMCCn4IYVd2pcKXKXWE8ympuf3E5wGYeiVpLBM/ th7qdEF87sViV8McfiRuXEonYrs1nSQZX+f4OxvTQqaP46u10rQsUHJvZ2VueSBT ZWN1cml0eSBUZWFtIDxzZWN1cml0eUBwcm9nZW55LmNvbT6IVwQTEQIAFwUCOsql WQULBwoDBAMVAwIDFgIBAheAAAoJEEnBfSP5LU0f/sUAnjDpQs5SnFotNJ7GeIWx Ftf7AvBBAJ0cygWS0XRXxJJq2PKbCbdln+i4d7kEDQQ6yqcjEBAA465SSuC/yvN7 WeZAN9XperqZtxLCVe8hLfrLZ+9/Xn2ysuEEe90rYe1X0HbsB/mInHF3VmT+XvHB VdDQ7o0VMw7aeDgprt3jDQgT8gIesSOhZvulDujmLhykE+FT/V4lKpqO8prv7Ujs AfuC7g/X2dcV1+imNOeivLaCM0+HrwUhdvifWFDwE97wBkrda/vhu9zs3NwMeBVN UYfkRLPm+DGUSQVrteNiYJchhqfJB0mjrd+3FgnpCVgdU4c42epZ2ez/WTgTchoT duMCd1sM9gzvQIih56KzxlGL82PVS2m0PNxSQ8iZpheMMGWregjpjpMRcrRbSXy+ WmPBacOiE/MyxXand+lGzig/9Srm6msUT5jE/lDcfySznJWH8B/fqD7KM5Z0ZM+b 3xV0PzGyMld+m3BfGolqsd5bpo8HaWCWsZVYfgdXjoDPYptsoPdLesN6WIAHA1kU n2kckccz4xOoI/8MqKhkzZe0q5a9sv6RLBWDeVLxJnDuXZgcwCc4OvpcR4HnOE7c U5VsyjYwTkzGWWuQxb8uxng3akHTK2PqeZAnC0tvtuwI7QFhOq/dzz+zHzVH2+Qh 55Aq6DjA9yEs3P7g31wb3duGdWtuIXn+N85GiJdZ1EmJESQCuOYOSHsV4bGxKcpg PIpoSr5QBAUtUOTwN+xC8nNjZtC5OzsAAwYP/1OD/eiEraGpy7Z9scgXBjjb1kly tgq06zGlSMWPEQoN3F87YeMiOsXSeDxJG+cnhvlys1Qoytp9/drsDLANi+Q61A/b aka2IJLudiDu4iUDFb1rgRUERBciA31karPf2IwNjdU8lbulHfxQcjtjj7rbSWOG gxzlPcLp2F5ee3h0qs+XW4UpD6K9f/u9gGT4nMr3owG06uNomlBAsGCVpk9XlRxG x96161vrbmTPUx/o6NhqHNuf5Zh8ZmxQ3PYydywiE9njOtS04TTad24qbdPlVQh2 kjkTdsMCFRGaAB8EYImMT3F0ofon1Q/XWZrRlhkZpzuAKLhdSOW5G+tygNy2IqsH wCYa/rDitYZeNN4EUb5At4HnSBCy86GFQgj+sDFO6yp+h7NLIMeTm0csaSbKEt6o cbn0iMaRbLdHmAm0UHATPho+M2brf3mTztvAPONta2FC9TP1L1ojTDd4mtO9IcdM hjOVqNbuyLXkWgPcSmwhhjB61p3/1M1Y/zfXxLOsi/XJlstYzzKzHa68F1e9dTEz kgeYo1hG5TqMKv1sXfPJHw4N/QVcLoUlpUJZ/kI2OQD5mAhCCZ9PbT2fT4gLhy7U sn0blh/R/0HFSFDwHgmx8mNfw7w0qFbba9/FEE8D5qhyyCx5KTk0OkvRL9OpzO7E jzjdcfb6B2XpgSC8iEYEGBECAAYFAjrKpyMACgkQScF9I/ktTR90vgCggiX108DO S3rhSkmfFuHey8w4RlIAn3nD+uCe+sjCFqVwb+LY2jO3ybjB =6dRm - -----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (GNU/Linux) Comment: For info see http://www.gnupg.org iEYEARECAAYFAjrV7doACgkQScF9I/ktTR/+zgCdH/4Y0t29KikyLZBWaU1TEz9i 4bQAmQFsCG52uDUKrW+0UTib5j63vmXx =uyhi -----END PGP SIGNATURE----- (6359982) /Progeny Security Team <security@PROGENY.COM>/(Ombruten)