Bugtraq mailing list archives
Re: [linux-security] Re: [RHSA-2000:028-02] Netscape 4.73 available
From: tony () GROWZONE COM AU (Tony Nugent)
Date: Mon, 29 May 2000 09:39:28 +1000
This posting is already outdated, 4.73 appears to have similar bugs. ------------------------------- CERT Advisory CA-2000-08 Inconsistent Warning Messages in Netscape Navigator Original release date: May 26, 2000 Last Revised: -- Source: CERT/CC A complete revision history is at the end of this file. Systems Affected * Systems running Netscape Navigator, up to and including Navigator 4.73, without the Personal Security Manager installed Overview A flaw exists in Netscape Navigator that could allow an attacker to masquerade as a legitimate web site if the attacker can compromise the validity of certain DNS information. This is different from the problem reported in CERT Advisory CA-2000-05, but it has a similar impact. This vulnerability was recently discovered by Kevin Fu of of the Massachusetts Institute of Technology and, independently, by Jon Guyer. If a user visits a web site in which the certificate name does not match the site name and proceeds with the connection despite the warning produced by Netscape, then subsequent connections to any sites that have the same certificate will not result in a warning message. [...] On Sat May 27 2000 at 09:35, "Jean-Mario" wrote:
----- Original Message ----- From: <bugzilla () redhat com> To: <redhat-watch-list () redhat com> Cc: <linux-security () redhat com>; <bugtraq () securityfocus com> Sent: Friday, May 19, 2000 8:11 PM Subject: [RHSA-2000:028-02] Netscape 4.73 available--------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Netscape 4.73 available Advisory ID: RHSA-2000:028-02 Issue date: 2000-05-19 Updated on: 2000-05-19 Product: Red Hat Linux Keywords: netscape SSL telnet rlogin Cross references:http://www.securityfocus.com/vdb/bottom.html?section=discussion&vid=1188--------------------------------------------------------------------- 1. Topic: Netscape 4.73 packages are available. These new packages fix bugs in SSL certificate validation; these bugs could allow for the compromising of encrypted SSL sessions. It is recommended that all users of Netscape update to the new packages. 2. Relevant releases/architectures: Red Hat Linux 5.2 - i386 Red Hat Linux 6.2 - i386 alpha 3. Problem description: The description of the vulnerability, taken from http://www.securityfocus.com/: -- An attacker poisons a nameserver to redirect all connections to www.goodguy.com, normally 100.100.100.100, to 99.99.99.99, www.badguy.com. The attacker causes all normal http requests to return what they normally would on www.goodguy.com, even though a user attempting to contact www.goodguy.com hits www.badguy.com. Upon getting a hit to www.badguy.com, the attacker causes an SSL connection to be established. This can be done by embedding a small image. The user may or may not get a warning about establishing a secure connection -- this warning is on by default, although many users will choose to disable this warning. The attacker needs to use a legitimate SSL key, certified by someone listed as trustworthy (thwate.com, for instance) The user can continue to shop to their hearts content, on the real site, as it's being proxied. When the user decides to check out, it will attempt to establish an SSL connection to www.goodguy.com. Upon checking the ip address for www.goodguy.com, for establishing an SSL connection, it will note that an SSL connection already exists to it's IP. The key, however, was issued to www.badguy.com. The SSL connection will be established, and by all indications appear to go to www.goodguy.com, when in fact it is to www.badguy.com. This could be used by a would be attacker to steal information such as credit cards, or any other information protected by SSL. --- Another minor vulnerability exists in current versions of Netscape; by default, netscape will respond to rlogin: and telnet: URLs by launching a helper application of the appropriate type. It is possible that when following URLs of these types that certain information about the local user (user name, environment settings) can be exposed to a remote host. To change the default associations to avoid this, users can go to Edit->Preferences, and choose Communicator->Applications. Then, change the default commands associated with 'telnet' and 'rlogin' to something that does not open up a connection to the remote host, for example, simply 'xterm'. 4. Solution: For each RPM for your particular architecture, run: rpm -Fvh [filename] where filename is the name of the RPM. For Red Hat Linux 5.0 and 5.1, use the Red Hat Linux 5.2 packages. For Red Hat Linux 6.0 and 6.1, use the Red Hat Linux 6.2 packages. 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 11379 - Netscape 4.73 release for security problems in 4.72 6. RPMs required: Red Hat Linux 5.2: intel: ftp://ftp.redhat.com/5.2/i386/netscape-common-4.73-0.5.2.i386.rpm ftp://ftp.redhat.com/5.2/i386/netscape-navigator-4.73-0.5.2.i386.rpm ftp://ftp.redhat.com/5.2/i386/netscape-communicator-4.73-0.5.2.i386.rpm sources: ftp://ftp.redhat.com/5.2/SRPMS/netscape-4.73-0.5.2.src.rpm Red Hat Linux 6.2: intel: ftp://ftp.redhat.com/6.2/i386/netscape-common-4.73-1.i386.rpm ftp://ftp.redhat.com/6.2/i386/netscape-navigator-4.73-1.i386.rpm ftp://ftp.redhat.com/6.2/i386/netscape-communicator-4.73-1.i386.rpm alpha: ftp://ftp.redhat.com/6.2/alpha/netscape-common-4.73-1.alpha.rpm ftp://ftp.redhat.com/6.2/alpha/netscape-navigator-4.73-1.alpha.rpm ftp://ftp.redhat.com/6.2/alpha/netscape-communicator-4.73-1.alpha.rpm sources: ftp://ftp.redhat.com/6.2/SRPMS/netscape-4.73-1.src.rpm ftp://ftp.redhat.com/6.2/SRPMS/netscape-alpha-4.73-1.src.rpm 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 3e881194baf12d2d7e761a63041ba404 5.2/SRPMS/netscape-4.73-0.5.2.src.rpm 52498e09827f5e854f99e320e2923fc45.2/i386/netscape-common-4.73-0.5.2.i386.rpm1e15dfb4454c36e7352cd1803974f8715.2/i386/netscape-communicator-4.73-0.5.2.i386.rpm703a4a0b80ca0c45967cb8cc569b06005.2/i386/netscape-navigator-4.73-0.5.2.i386.rpma83932536aef2837be8733621c3415d0 6.2/SRPMS/netscape-4.73-1.src.rpm bb79a4d70ebc7ab6cd91c04fbb951ca8 6.2/SRPMS/netscape-alpha-4.73-1.src.rpm e800a7af7c20be924469aedb75ad807f6.2/alpha/netscape-common-4.73-1.alpha.rpm9502f4ec6d2c99f8f61329898f31450f6.2/alpha/netscape-communicator-4.73-1.alpha.rpmd812be498d83e19dba903282c8805ee26.2/alpha/netscape-navigator-4.73-1.alpha.rpmde054f11902c5777446baff909da817c 6.2/i386/netscape-common-4.73-1.i386.rpm d3825c0c61838da0b35570fb0dc7e7436.2/i386/netscape-communicator-4.73-1.i386.rpmaea9965093a8202196f637e8385035d96.2/i386/netscape-navigator-4.73-1.i386.rpmThese packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/corp/contact.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: N/A -- To unsubscribe: mail redhat-watch-list-request () redhat com with "unsubscribe" as the Subject.-- ---------------------------------------------------------------------- Please refer to the information about this list as well as general information about Linux security at http://www.aoy.com/Linux/Security. ---------------------------------------------------------------------- To unsubscribe: mail -s unsubscribe linux-security-request () redhat com < /dev/null
Cheers Tony -=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=- Tony Nugent <Tony () growzone com au> Systems Administrator, RHCE GrowZone OnLine (a project of) GrowZone Development Network POBox 475 Toowoomba Oueensland Australia 4350 Ph: 07 4637 8322 -=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-=*#*=-
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- Re: [linux-security] Re: [RHSA-2000:028-02] Netscape 4.73 available Tony Nugent (May 28)