Multiple vendor OpenSSL DSA_verify() certificate chain validation security bypass

openssl-dsa-verify-security-bypass (47837) The risk level is classified as MediumMedium 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

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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