Ruby OCSP_basic_verify() spoofing

ruby-ocspbasicverify-spoofing (48761) The risk level is classified as MediumMedium Risk

Description:

Ruby could allow a remote attacker to conduct spoofing attacks, caused by the improper return of information by the OCSP_basic_verify() function when validating X.509 certificates. An attacker could accept a revoked x.509 certificate as valid and exploit this vulnerability to redirect a user to a malicious Web site that would appear to be trusted. This could allow the attacker to obtain sensitive information that could be used to launch further attacks against the victim's system.

*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
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Uncorroborated

Consequences:

Gain Access

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • Debian Bug report logs - #513528: ruby1.9: Not properly checking the return value of OCSP_basic_verify.
  • Ruby 1.9 - Bug #1091: possible bad handling of return value of OCSP_basic_verify in ext/openssl/ossl_ocsp.c.
  • Ruby Programming Language Web site: Ruby Programming Language.
  • ASA-2009-262: ruby security update (RHSA-2009-1140)
  • BID-33769: Ruby 'OCSP_basic_verify()' X.509 Certificate Verification Vulnerability
  • CVE-2009-0642: ext/openssl/ossl_ocsp.c in Ruby 1.8 and 1.9 does not properly check the return value from the OCSP_basic_verify function, which might allow remote attackers to successfully present an invalid X.509 certificate, possibly involving a revoked certificate.
  • DSA-1860: ruby1.9 -- several vulnerabilities
  • MDVSA-2009:193: ruby
  • MDVSA-2009:325: ruby
  • OSVDB ID: 52194: Ruby ext/openssl/ossl_ocsp.c OCSP_basic_verify() Function X.509 Certificate Handling Weakness
  • RHSA-2009-1140: Moderate: ruby security update
  • SA33750: Ruby "OCSP_basic_verify()" Certificate Validation Vulnerability
  • SECTRACK ID: 1022505: Ruby OCSP_basic_verify() Validation Flaw Lets Remote Users Conduct Certificate Spoofing Attacks
  • SUSE-SA:2009:037: dhcp-client security problem
  • USN-805-1: Ruby vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux 2008.1
  • MandrakeSoft Mandrake Linux 2008.1 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • Mandriva Enterprise Server 5
  • Mandriva Enterprise Server 5 X86_64
  • Mandriva Linux 2009.0 X86_64
  • Mandriva Linux 2009.0
  • Mandriva Linux 2009.1 X86_64
  • Mandriva Linux 2009.1
  • Novell Linux Desktop 9
  • Novell Linux POS 9
  • Novell Open Enterprise Server
  • Novell OpenSUSE 10.3
  • Novell OpenSUSE 11.0
  • Novell SLE SDK 10 SP2
  • Novell SUSE Linux Enterprise 10 SP2 DEBUGINFO
  • Novell SUSE Linux Enterprise Desktop 10 SP2
  • Novell SUSE Linux Enterprise Server 10 SP2
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4.8.z AS
  • RedHat Enterprise Linux 4.8.z ES
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5.3.z EUS
  • RedHat Enterprise Linux Long Life 5.3
  • Ruby-lang Ruby 1.8
  • Ruby-lang Ruby 1.8.1
  • Ruby-lang Ruby 1.8.2 Preview1
  • Ruby-lang Ruby 1.8.2 Preview2
  • Ruby-lang Ruby 1.8.2
  • Ruby-lang Ruby 1.8.2 Preview3
  • Ruby-lang Ruby 1.8.2 Preview4
  • Ruby-lang Ruby 1.8.3
  • Ruby-lang Ruby 1.8.4
  • Ruby-lang Ruby 1.8.5
  • Ruby-lang Ruby 1.8.5 P231
  • Ruby-lang Ruby 1.8.5 P115
  • Ruby-lang Ruby 1.8.5 P230
  • Ruby-lang Ruby 1.8.6 P230
  • Ruby-lang Ruby 1.8.6 P114
  • Ruby-lang Ruby 1.8.6 P287
  • Ruby-lang Ruby 1.8.6 P229
  • Ruby-lang Ruby 1.8.6
  • Ruby-lang Ruby 1.8.6 P286
  • Ruby-lang Ruby 1.8.7 P21
  • Ruby-lang Ruby 1.8.7
  • Ruby-lang Ruby 1.8.7 P71
  • Ruby-lang Ruby 1.8.7 P72
  • Ruby-lang Ruby 1.8.7 P22
  • Ruby-lang Ruby 1.9
  • Ruby-lang Ruby 1.9 -1
  • Ruby-lang Ruby 1.9 -2
  • Ruby-lang Ruby 1.9.1
  • SuSE SuSE SLES 9

Reported:

Jan 29, 2009

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