[security bulletin] SSRT4779 - rev.0 HP-UX Netscape NSS Library Suite SSLv2 remote buffer overflow
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HP SECURITY BULLETIN
HPSBUX01070 REVISION: 0
SSRT4779 HP-UX Netscape NSS Library Suite SSLv2
remote buffer overflow
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NOTICE:
There are no restrictions for distribution of this Bulletin
provided that it remains complete and intact.
The information in this Security bulletin should be acted upon
as soon as possible.
INITIAL RELEASE: 23 August 2004
POTENTIAL SECURITY IMPACT: Remote buffer overflow and
arbitrary code execution
SOURCE: HEWLETT-PACKARD COMPANY
HP Software Security Response Team
REFERENCES: http://xforce.iss.net/xforce/alerts/id/180
VULNERABILITY SUMMARY:
A potential security vulnerability has been identified with
Network Security Services (NSS) library suite using SSLv2 ciphers
running on HP-UX. A buffer overflow could be exploited remotely
to execute arbitrary code or create a Denial of Service against
products or services that implement vulnerable versions of the
NSS library.
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions
are listed.
Any application or product that integrates the NSS library suite
and which implements SSLv2 ciphers may be affected.
Netscape - Directory Server (NDS) - currently supported versions,
Netscape - Administration Server (AS) - currently supported
versions.
BACKGROUND:
Internet Security Systems, Inc. (ISS) has reported buffer
overflow vulnerabilities in all known releases of the Network
Security Services (NSS) library suite.
http://xforce.iss.net/xforce/alerts/id/180
AFFECTED VERSIONS
Note: To determine if a system has an affected version,
search the output of "swlist -a revision -l fileset"
for an affected fileset. Then determine if the
recommended patch or update is installed.
HP-UX B.11.23
HP-UX B.11.11
HP-UX B.11.00
=============
For versions NDS 6.02, and 6.11 with AS 6.01 and 6.1
NetscapeDirSvr6.NDS-SLAPD
NetscapeDirSvr6.NDS-ADM
action: follow procedure described in the Resolution section.
For version NDS 4.16 with AS 4.2
NscapeDir40SrvUS.DirectoryServer
NscapeDir40SrvUS.AdminServer
action: upgrade to NDS 6.11.
END AFFECTED VERSIONS
NOTE: If still using NDS version 4.16 HP recommends upgrading
to version 6.11 or subsequent and following the
recommendations herein.
This bulletin will be updated when a new NDS release is
available.
RESOLUTION:
Disabling all SSLv2 cipher suites effectively mitigates these
vulnerabilities.
NOTE: Simply disabling SSLv2 does not fully protect against
attack. All SSLv2 cipher suites must be disabled explicitly
in order to perform this mitigation.
Instructions for disabling the SSLv2 cipher suites for Netscape
Directory Server (NDS) and Administration Server (AS) are
provided below.
A. Netscape Directory Server (NDS)
These changes apply to Netscape Directory Server versions
6.02 and 6.11.
1. Stop NDS.
2. Open the
/var/opt/netscape/servers/slapd-{instance}/config/dse.ldif
file in an editor.
3. DisablealloftheSSLv2ciphersinthe"dn:cn=encryption,cn=config"
entry.
To accomplish this, add the following to the comma separated
list of ciphers in the "nsSSL3ciphers" attribute:
-rc4
-rc4export
-rc2
-rc2export
-des
-desede3
It is important to include the minus sign before each cipher when
modifying the "nsSSL3ciphers" to negate the attribute in order to
tell Netscape Directory Server not to support those ciphers.
For example, the nsSSL3ciphers attribute with the correct
ciphers disabled:
nsSSL3Ciphers:
-rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc4_40_md5,+rsa_rc2_40_md5,
+rsa_des_sha,+rsa_fips_des_sha,+rsa_3des_sha,+rsa_fips_3des_sha,
+fortezza,+fortezza_rc4_128_sha,+fortezza_null,
+tls_rsa_export1024_with_rc4_56_sha,
+tls_rsa_export1024_with_des_cbc_sha,
-rc4,-rc4export,-rc2,-rc2export,-des,-desede3
3. Start NDS.
NOTE: If modification of cipher preferences is performed through
the Directory Server Console, any previous entries added
manually will be lost, and the process of modifying the
dse.ldif file will be required again.
B. Administration Server (AS)
To disable SSLv2 via the admin server console:
1. Login to admin server console
2. Select the Administration Server
3. Select the Configuration tab
4. Select the Encryption Tab
5. Click the Cipher Settings button
6. Uncheck all ciphers in the SSL 2.0 tab
7. Click Ok, then Save
8. Restart the server
To disable SSLv2 manually via the configuration files:
1. Stop the server.
2. Edit /var/opt/netscape/servers/admin-serv/config/server.xml
a. In the SSLPARAMS element there is an SSLv2 attribute.
Set this to "off".
b. To also disable all of the SSLv2 ciphers, replace "+" with
"-" in the ssl2ciphers attribute for all of the ciphers
listed.
An example follows:
ssl2ciphers="-rc4,-rc4export,-rc2,-rc2export,
-des,-desede3" ssl3="on"
ssl3tlsciphers="+rsa_rc4_128_md5,+rsa_3des_sha,+rsa_des_sha,
+rsa_rc4_40_md5,+rsa_rc2_40_md5,-rsa_null_md5"
3. Edit /var/opt/netscape/servers/admin-serv/config/local.conf
a. In the configuration.encryption.nsSSL2 attribute,
set the value to "off".
b. To also disable all of the SSLv2 ciphers, replace "+" with
"-" in the configuration.encryption.nsSSL2Ciphers attribute
for all of the ciphers listed.
An example follows:
configuration.encryption.nsSSL2: off
configuration.encryption.nsSSL3: on
configuration.encryption.nsSSL2Ciphers: -desede3,-des,-rc4,-rc2,
-rc4export,-rc2export
configuration.encryption.nsSSL3Ciphers: +fips_3des_sha,
+rsa_des_sha,-rsa_null_md5,+rsa_rc4_128_md5,+rsa_rc2_40_md5,
+fips_des_sha,+rsa_rc4_40_md5,+rsa_3des_sha
4. Start the server
MANUAL ACTIONS: Yes - NonUpdate
For Netscape Directory Server (NDS) 4.16 upgrade to 6.11 and
follow the procedure in the Resolution section of this bulletin.
For Netscape Directory Server (NDS) 6.02 and 6.11 follow the
procedure in the Resolution section of this bulletin.
For Administration Server (AS) 4.2 upgrade to 6.01 or 6.1 and
follow the procedure in the Resolution section of this bulletin.
For Administration Server (AS) 6.01 and 6.1 follow the
procedure in the Resolution section of this bulletin.
BULLETIN REVISION HISTORY:
Revision 0 19 August 2004
Initial release
* The software product category that this Security Bulletin
relates to is represented by the 5th and 6th characters of the
Bulletin number: GN=General, MA=Management Agents,
MI=Misc. 3rd party, MP=HP-MPE/iX, NS=HP NonStop Servers,
OV=HP OpenVMS, PI=HP Printing & Imaging, ST=HP Storage,
TU=HP Tru64 UNIX, TL=Trusted Linux, UX=HP-UX, VV=Virtual Vault
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NOTE: Installing patches listed in the Security Patch Matrix will
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Bulletin RESOLUTION has been implemented on HP-UX 11.XX Versions
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displayProductInfo.pl?productNumber=B6834AA
REPORT: To report a potential security vulnerability with any HP
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System management and security procedures must be reviewed
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"HP is broadly distributing this Security Bulletin in order to
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