Note: This is an archival copy of Security Sun Alert 250826 as previously published on http://sunsolve.sun.com.|
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1020011.1.
Solaris 10 Operating System
Date of Preliminary Release
Date of Workaround Release
Date of Resolved Release
Security vulnerability in OpenSSL due to improper usage of signature verification:
An insufficient validation security vulnerability in OpenSSL may allow a malformed signature to be treated as a good signature rather than as an error. This issue affects the signature checks on DSA keys used with SSL/TLS. This vulnerability may allow a remote user who is in control of a rogue server or who can use a "man-in-the-middle attack" to masquerade as a valid, legitimate server using malformed SSL certificates.
Sun acknowledges with thanks, Google Security Team for bringing this issue to our attention.
This issue is also referenced in the following document:
This issue can occur in the following releases:
Note 2: Solaris 9 does not ship with OpenSSL libraries which can be used for third-party application usage. WANboot in Solaris 9 which contains libssl, is only capable of using RSA certificates and hence not affected.
Note 3: OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived. To determine the base build of OpenSolaris, the following command can be used:
$ uname -vNote 4: Only OpenSolaris installations including the affected binary "/usr/sfw/bin/openssl" or "/usr/lib/libssl.so" are impacted by this issue.
Note 5: Use of OpenSSL as an SSL/TLS client when connecting to a server whose certificate contains a RSA key is not affected. Verification of client certificates by OpenSSL servers for *any* key type is not affected.
Note 6: To determine if a server certificate contains a DSA key, inspect the "Subject Public Key Info" section. This can be done using the command:
$ openssl x509 -in server-certificate.pem -text
There are no predictable symptoms that would indicate the described issue has occurred.
There is no workaround for this issue. Please see the Resolution section below.
This issue is addressed in the following releases:
For more information on Security Sun Alerts, see 1009886.1.
Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.
16-Mar-2009: Updated the Relief/Workaround and Resolution sections. Resolved.
18-Feb-2009: Updated the Relief/Workaround section.
24-Feb-2009: Updated the Relief/Workaround and Resolution sections.
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