Multiple vendor OpenSSL DSA_verify() certificate chain validation security bypass
| openssl-dsa-verify-security-bypass (47837) |  Medium Risk |
Description:
Multiple vendor applications that use the OpenSSL DSA_verify function could allow a remote attacker to bypass signature validation checks. Various functions within the OpenSSL library fail to properly check results returned by the DSA_verify function. An attacker could exploit this vulnerability using a malicious server or man-in-the-middle techniques to bypass digital signature certificate chain validation, and possibly gain unauthorized access to a vulnerable client.
*CVSS:
| Base Score: | 4.3 |
| Access Vector: | Network |
| Access Complexity: | Medium |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 3.2 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
For Lasso:
Upgrade to the latest version of Lasso (2.2.1 or later), available from the Lasso Web site. See References.
For other distributions:
Contact your vendor for patch or upgrade information. See References.
References:
- Lasso Web site: Lasso - Free Liberty Alliance Single Sign On.
- oCERT Advisories #2008-016 : multiple OpenSSL signature verification API misuse .
- VMSA-2009-0004: ESX Service Console updates for openssl, bind, and vim.
- ZXID Web site: ZXID Home - Open Source IdM for the Masses - SAML SSO.
- BID-33151: Multiple Vendor OpenSSL 'DSA_verify' Function Signature Verification Vulnerability
- CVE-2009-0050: Lasso 2.2.1 and earlier does not properly check the return value from the OpenSSL DSA_verify function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.
- CVE-2009-0051: ZXID 0.29 and earlier does not properly check the return value from the OpenSSL DSA_verify function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.
- DSA-1700: lasso -- incorrect API usage
- VUPEN/ADV-2009-0041: Lasso OpenSSL DSA_verify() Signature Spoofing Vulnerability
- VUPEN/ADV-2009-0049: ZXID OpenSSL DSA_verify() Signature Spoofing Vulnerability
Platforms Affected:
- Debian Debian Linux 4.0
- Lasso Lasso 1.9.9.0
- Lasso Lasso 2.0.0-1
- Lasso Lasso 2.2.1-0
- VMware ESX Server 2.5.5
- VMware ESX Server 3.0.2
- VMware ESX Server 3.0.3
- VMware ESX Server 3.5
- ZXID ZXID 0.1
- ZXID ZXID 0.10
- ZXID ZXID 0.11
- ZXID ZXID 0.12
- ZXID ZXID 0.13
- ZXID ZXID 0.14
- ZXID ZXID 0.15
- ZXID ZXID 0.16
- ZXID ZXID 0.17
- ZXID ZXID 0.18
- ZXID ZXID 0.19
- ZXID ZXID 0.2
- ZXID ZXID 0.20
- ZXID ZXID 0.21
- ZXID ZXID 0.22
- ZXID ZXID 0.25
- ZXID ZXID 0.26
- ZXID ZXID 0.27
- ZXID ZXID 0.28
- ZXID ZXID 0.29
- ZXID ZXID 0.3
- ZXID ZXID 0.4
- ZXID ZXID 0.5
- ZXID ZXID 0.6
- ZXID ZXID 0.7
- ZXID ZXID 0.8
- ZXID ZXID 0.9
Reported:
Jan 07, 2009
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.