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RedHat 6.2: Bugs in SSL certificate validation Print E-mail
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Posted by Team   
RedHat Linux These new packages fix bugs in SSL certificate validation; these bugs could allow for the compromising of encrypted SSL sessions.
                   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:

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
An   attacker  poisons  a  nameserver   to  redirect  all
connections to, normally,    to,

The  attacker causes  all normal http  requests to return
what  they normally would on, even though
a   user  attempting  to   contact  hits

Upon  getting  a  hit  to,  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 (, 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  Upon
checking   the  ip   address  for,  for
establishing  an SSL connection, it will note that an SSL
connection  already exists to it's  IP. The key, however,
was  issued to The SSL connection will be
established,  and  by  all indications  appear  to  go to,  when in  fact it is  to

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.Red for more info):

11379 - Netscape 4.73 release for security problems in 4.72

6. RPMs required:

Red Hat Linux 5.2:



Red Hat Linux 6.2:




7. Verification:

MD5 sum                           Package Name
3e881194baf12d2d7e761a63041ba404  5.2/SRPMS/netscape-4.73-0.5.2.src.rpm
52498e09827f5e854f99e320e2923fc4  5.2/i386/netscape-common-4.73-0.5.2.i386.rpm
1e15dfb4454c36e7352cd1803974f871  5.2/i386/netscape-communicator-4.73-0.5.2.i386.rpm
703a4a0b80ca0c45967cb8cc569b0600  5.2/i386/netscape-navigator-4.73-0.5.2.i386.rpm
a83932536aef2837be8733621c3415d0  6.2/SRPMS/netscape-4.73-1.src.rpm
bb79a4d70ebc7ab6cd91c04fbb951ca8  6.2/SRPMS/netscape-alpha-4.73-1.src.rpm
e800a7af7c20be924469aedb75ad807f  6.2/alpha/netscape-common-4.73-1.alpha.rpm
9502f4ec6d2c99f8f61329898f31450f  6.2/alpha/netscape-communicator-4.73-1.alpha.rpm
d812be498d83e19dba903282c8805ee2  6.2/alpha/netscape-navigator-4.73-1.alpha.rpm
de054f11902c5777446baff909da817c  6.2/i386/netscape-common-4.73-1.i386.rpm
d3825c0c61838da0b35570fb0dc7e743  6.2/i386/netscape-communicator-4.73-1.i386.rpm
aea9965093a8202196f637e8385035d9  6.2/i386/netscape-navigator-4.73-1.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:

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