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RedHat: OpenSSL timing-based attack vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
RedHat Linux This update fixes a timing-based attack on CBC cipher suites used in SSL and TLS which OpenSSL was found to be vulnerable to.

---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated OpenSSL packages fix timing attack
Advisory ID:       RHSA-2003:062-11
Issue date:        2003-02-19
Updated on:        2003-03-06
Product:           Red Hat Linux
Keywords:          
Cross references:  
Obsoletes:         RHSA-2002:160
CVE Names:         CAN-2003-0078
---------------------------------------------------------------------

1. Topic:

Updated OpenSSL packages are available that fix a potential timing-based
attack.

2. Relevant releases/architectures:

Red Hat Linux 6.2 - i386
Red Hat Linux 7.0 - i386
Red Hat Linux 7.1 - i386
Red Hat Linux 7.2 - i386, i686, ia64
Red Hat Linux 7.3 - i386, i686
Red Hat Linux 8.0 - i386, i686

3. Problem description:

OpenSSL is a commercial-grade, full-featured, and open source toolkit that 
implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer
Security (TLS v1) protocols as well as a full-strength general purpose
cryptography library.

In a paper, Brice Canvel, Alain Hiltgen, Serge Vaudenay, and Martin
Vuagnoux describe and demonstrate a timing-based attack on CBC ciphersuites
in SSL and TLS.  An active attacker may be able to use timing observations
to distinguish between two different error cases: cipher padding errors and
MAC verification errors.  Over multiple connections this can leak
sufficient information to make it possible to retrieve the plaintext of a
common, fixed block.

In order for an attack to be sucessful, an attacker must be able to act as
a man-in-the-middle to intercept and modify multiple connections, which all
involve a common fixed plaintext block (such as a password), and have good
network conditions that allow small changes in timing to be reliably
observed.

These erratum packages contain a patch provided by the OpenSSL group that
corrects this vulnerability.

Because server applications are affected by these vulnerabilities, we
advise users to restart all services that use OpenSSL functionality or
alternatively reboot their systems after installing these updates.

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. RPMs required:

Red Hat Linux 6.2:

SRPMS: 
ftp://updates.Red Hat.com/6.2/en/os/SRPMS/openssl-0.9.5a-30.src.rpm

i386: 
ftp://updates.Red Hat.com/6.2/en/os/i386/openssl-0.9.5a-30.i386.rpm 
ftp://updates.Red Hat.com/6.2/en/os/i386/openssl-devel-0.9.5a-30.i386.rpm 
ftp://updates.Red Hat.com/6.2/en/os/i386/openssl-perl-0.9.5a-30.i386.rpm 
ftp://updates.Red Hat.com/6.2/en/os/i386/openssl-python-0.9.5a-30.i386.rpm

Red Hat Linux 7.0:

SRPMS: 
ftp://updates.Red Hat.com/7.0/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm 
ftp://updates.Red Hat.com/7.0/en/os/SRPMS/openssl-0.9.6-14.src.rpm

i386: 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssl-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssl-devel-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssl-perl-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssl-python-0.9.6-14.i386.rpm

Red Hat Linux 7.1:

SRPMS: 
ftp://updates.Red Hat.com/7.1/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm 
ftp://updates.Red Hat.com/7.1/en/os/SRPMS/openssl-0.9.6-14.src.rpm

i386: 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssl-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssl-devel-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssl-perl-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssl-python-0.9.6-14.i386.rpm

Red Hat Linux 7.2:

SRPMS: 
ftp://updates.Red Hat.com/7.2/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm 
ftp://updates.Red Hat.com/7.2/en/os/SRPMS/openssl096-0.9.6-13.7.src.rpm 
ftp://updates.Red Hat.com/7.2/en/os/SRPMS/openssl-0.9.6b-30.7.src.rpm

i386: 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssl096-0.9.6-13.7.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssl-0.9.6b-30.7.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssl-devel-0.9.6b-30.7.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssl-perl-0.9.6b-30.7.i386.rpm

i686: 
ftp://updates.Red Hat.com/7.2/en/os/i686/openssl-0.9.6b-30.7.i686.rpm

ia64: 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssl095a-0.9.5a-18.7.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssl096-0.9.6-13.7.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssl-0.9.6b-30.7.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssl-devel-0.9.6b-30.7.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssl-perl-0.9.6b-30.7.ia64.rpm

Red Hat Linux 7.3:

SRPMS: 
ftp://updates.Red Hat.com/7.3/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm 
ftp://updates.Red Hat.com/7.3/en/os/SRPMS/openssl096-0.9.6-13.7.src.rpm 
ftp://updates.Red Hat.com/7.3/en/os/SRPMS/openssl-0.9.6b-30.7.src.rpm

i386: 
ftp://updates.Red Hat.com/7.3/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/openssl096-0.9.6-13.7.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/openssl-0.9.6b-30.7.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/openssl-devel-0.9.6b-30.7.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/openssl-perl-0.9.6b-30.7.i386.rpm

i686: 
ftp://updates.Red Hat.com/7.3/en/os/i686/openssl-0.9.6b-30.7.i686.rpm

Red Hat Linux 8.0:

SRPMS: 
ftp://updates.Red Hat.com/8.0/en/os/SRPMS/openssl095a-0.9.5a-19.src.rpm 
ftp://updates.Red Hat.com/8.0/en/os/SRPMS/openssl096-0.9.6-14.src.rpm 
ftp://updates.Red Hat.com/8.0/en/os/SRPMS/openssl-0.9.6b-31.src.rpm

i386: 
ftp://updates.Red Hat.com/8.0/en/os/i386/openssl095a-0.9.5a-19.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/openssl096-0.9.6-14.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/openssl-0.9.6b-31.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/openssl-devel-0.9.6b-31.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/openssl-perl-0.9.6b-31.i386.rpm

i686: 
ftp://updates.Red Hat.com/8.0/en/os/i686/openssl-0.9.6b-31.i686.rpm



6. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
43fc50cff822dc459bb38e8c369e8965 6.2/en/os/SRPMS/openssl-0.9.5a-30.src.rpm
89f90fbdbf3731f4cd0af1f362ff10bc 6.2/en/os/i386/openssl-0.9.5a-30.i386.rpm
aeba8db707ac96a25dac61586b547ea5 6.2/en/os/i386/openssl-devel-0.9.5a-30.i386.rpm
8b94e526b689a4a6325031b380ec7b37 6.2/en/os/i386/openssl-perl-0.9.5a-30.i386.rpm
4e9fb9fcea2d4d6c9c9f5d0d500b94e1 6.2/en/os/i386/openssl-python-0.9.5a-30.i386.rpm
b1306cc627ed2eee6583cda7318c5d21 7.0/en/os/SRPMS/openssl-0.9.6-14.src.rpm
4eeca68ad45a889cf99e9888244f811f 7.0/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm
eafaadaed7be24dfe9f1335d9de6af19 7.0/en/os/i386/openssl-0.9.6-14.i386.rpm
5da72b7b35a9d8529316bd34810406c8 7.0/en/os/i386/openssl-devel-0.9.6-14.i386.rpm
e2d6359f0569c7da631d72f80fe16735 7.0/en/os/i386/openssl-perl-0.9.6-14.i386.rpm
96088bee90bd4c827731316581ce598e 7.0/en/os/i386/openssl-python-0.9.6-14.i386.rpm
0c8458c5fe99f2dccbd99fc1471e579d 7.0/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm
b1306cc627ed2eee6583cda7318c5d21 7.1/en/os/SRPMS/openssl-0.9.6-14.src.rpm
4eeca68ad45a889cf99e9888244f811f 7.1/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm
eafaadaed7be24dfe9f1335d9de6af19 7.1/en/os/i386/openssl-0.9.6-14.i386.rpm
5da72b7b35a9d8529316bd34810406c8 7.1/en/os/i386/openssl-devel-0.9.6-14.i386.rpm
e2d6359f0569c7da631d72f80fe16735 7.1/en/os/i386/openssl-perl-0.9.6-14.i386.rpm
96088bee90bd4c827731316581ce598e 7.1/en/os/i386/openssl-python-0.9.6-14.i386.rpm
0c8458c5fe99f2dccbd99fc1471e579d 7.1/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm
3ae2cc393a411ce6d4bf02ca2902c3b3 7.2/en/os/SRPMS/openssl-0.9.6b-30.7.src.rpm
4eeca68ad45a889cf99e9888244f811f 7.2/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm
f6e69835cf22aaf4ed81182d3b3238f2 7.2/en/os/SRPMS/openssl096-0.9.6-13.7.src.rpm
561ca4b931f7aa1b5e5b187eadc50979 7.2/en/os/i386/openssl-0.9.6b-30.7.i386.rpm
b800915ee28c2ee3e16f0efd3a982cfd 7.2/en/os/i386/openssl-devel-0.9.6b-30.7.i386.rpm
61343012eef3bbe98c0d84a507d42139 7.2/en/os/i386/openssl-perl-0.9.6b-30.7.i386.rpm
0c8458c5fe99f2dccbd99fc1471e579d 7.2/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm
f1f521a9af06532b0ca4cbadf191f9f6 7.2/en/os/i386/openssl096-0.9.6-13.7.i386.rpm
90238359f766d40a6fea1ce187378e0f 7.2/en/os/i686/openssl-0.9.6b-30.7.i686.rpm
d04117405d4d98952b45482b540adc48 7.2/en/os/ia64/openssl-0.9.6b-30.7.ia64.rpm
835873daf75483628c41030b2d3bf416 7.2/en/os/ia64/openssl-devel-0.9.6b-30.7.ia64.rpm
4bfc8f05437a13ceb5fbcad25e7a4a50 7.2/en/os/ia64/openssl-perl-0.9.6b-30.7.ia64.rpm
6405dbbcc5bb5bf240b4623456b4d6ab 7.2/en/os/ia64/openssl095a-0.9.5a-18.7.ia64.rpm
cca8bf123ae09e0c73b9a817b441af1b 7.2/en/os/ia64/openssl096-0.9.6-13.7.ia64.rpm
3ae2cc393a411ce6d4bf02ca2902c3b3 7.3/en/os/SRPMS/openssl-0.9.6b-30.7.src.rpm
4eeca68ad45a889cf99e9888244f811f 7.3/en/os/SRPMS/openssl095a-0.9.5a-18.7.src.rpm
f6e69835cf22aaf4ed81182d3b3238f2 7.3/en/os/SRPMS/openssl096-0.9.6-13.7.src.rpm
561ca4b931f7aa1b5e5b187eadc50979 7.3/en/os/i386/openssl-0.9.6b-30.7.i386.rpm
b800915ee28c2ee3e16f0efd3a982cfd 7.3/en/os/i386/openssl-devel-0.9.6b-30.7.i386.rpm
61343012eef3bbe98c0d84a507d42139 7.3/en/os/i386/openssl-perl-0.9.6b-30.7.i386.rpm
0c8458c5fe99f2dccbd99fc1471e579d 7.3/en/os/i386/openssl095a-0.9.5a-18.7.i386.rpm
f1f521a9af06532b0ca4cbadf191f9f6 7.3/en/os/i386/openssl096-0.9.6-13.7.i386.rpm
90238359f766d40a6fea1ce187378e0f 7.3/en/os/i686/openssl-0.9.6b-30.7.i686.rpm
280a5beecb76fe4f7a00a745cbc03737 8.0/en/os/SRPMS/openssl-0.9.6b-31.src.rpm
bd2e48a63222cde53b86b00acf368a1e 8.0/en/os/SRPMS/openssl095a-0.9.5a-19.src.rpm
c9103cd84c301e53c7c79f4e349b43fc 8.0/en/os/SRPMS/openssl096-0.9.6-14.src.rpm
aaffbdfe037fdfc0a3a45cea4e3fe7d9 8.0/en/os/i386/openssl-0.9.6b-31.i386.rpm
0a1a647afb7dea3de6bbac9603f3d45b 8.0/en/os/i386/openssl-devel-0.9.6b-31.i386.rpm
41c0188d93babf72ffa3dc88b42cc3a7 8.0/en/os/i386/openssl-perl-0.9.6b-31.i386.rpm
276c04536cfa314afa3154fb9ee58582 8.0/en/os/i386/openssl095a-0.9.5a-19.i386.rpm
8db8722990b478451e8fcb04aa14da2a 8.0/en/os/i386/openssl096-0.9.6-14.i386.rpm
12f5cab2bde7ac88bbb311aeba04bd9e 8.0/en/os/i686/openssl-0.9.6b-31.i686.rpm


These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at  http://www.Red Hat.com/about/contact/pgpkey.html

You can verify each package with the following command:
    
    rpm --checksig -v 

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum 


7. References:
 
http://lasecwww.epfl.ch/pub/lasec/doc/Vau02a.ps 
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0078

8. Contact:

The Red Hat security contact is <security@Red Hat.com>.  More contact
details at  http://www.Red Hat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.


 
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