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CVE-2009-0642· NVD / CVE Program· CNA mitre

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

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.6% (FIRST EPSS); higher than 85.2% of all records.
  • Fixed version: ruby1.8 (Debian:4.0) 1.8.5-4etch5; ruby1.9 (Debian:4.0) 1.9.0+20060609-1etch5; ruby1.8 (Debian:5.0) 1.8.7.72-3lenny1.

Low priority for now. Upgrade to ruby1.8 (Debian:4.0) 1.8.5-4etch5; ruby1.9 (Debian:4.0) 1.9.0+20060609-1etch5; ruby1.8 (Debian:5.0) 1.8.7.72-3lenny1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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.

MediumCVSS 6.8 · v2.0—No exploit Fix available
Published
Feb 20, 2009
Updated
Jun 16, 2026
EPSS
2.6% · 85th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.6%

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  • Not in KEV: no record of exploitation in the wild
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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ruby-langruby

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ruby-lang ruby1.8
  • ruby-lang ruby1.9

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:4.0ruby1.8before 1.8.5-4etch51.8.5-4etch5
Debian:4.0ruby1.9before 1.9.0+20060609-1etch51.9.0+20060609-1etch5
Debian:5.0ruby1.8before 1.8.7.72-3lenny11.8.7.72-3lenny1
Debian:5.0ruby1.9before 1.9.0.2-9lenny11.9.0.2-9lenny1
Red Hat:enterprise_linux:4::asirbbefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asrubybefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asruby-debuginfobefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asruby-develbefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asruby-docsbefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asruby-libsbefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asruby-modebefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:4::asruby-tcltkbefore 0:1.8.1-7.el4_8.30:1.8.1-7.el4_8.3
Red Hat:enterprise_linux:5::clientruby-docsbefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::clientruby-irbbefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::clientruby-libsbefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::clientruby-rdocbefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::clientruby-ribefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::clientruby-tcltkbefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::client_workstationrubybefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::client_workstationruby-debuginfobefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::client_workstationruby-develbefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7
Red Hat:enterprise_linux:5::client_workstationruby-modebefore 0:1.8.5-5.el5_3.70:1.8.5-5.el5_3.7

Same product

ruby-lang: all records

Other highest-scoring records for the same primary product.

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    57Plan
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    52Plan
  • CVE-2021-28966In Ruby through 3.0 on Windows, a remote attacker can submit a crafted path when a Web application handles a parameter with TmpDir.
    47Plan
  • CVE-2017-14064Ruby through 2.2.7, 2.3.x through 2.3.4, and 2.4.x through 2.4.1 can expose arbitrary memory during a JSON.generate call.
    42Plan
  • CVE-2017-17790The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demons
    41Plan
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    41Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ruby1.81.8.5-4etch5 · Debian:4.0Package registry (OSV)
debian:ruby1.91.9.0+20060609-1etch5 · Debian:4.0Package registry (OSV)
red hat:irb0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-debuginfo0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-devel0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-docs0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-irb0:1.8.5-5.el5_3.7 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:ruby-libs0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-mode0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-rdoc0:1.8.5-5.el5_3.7 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:ruby-ri0:1.8.5-5.el5_3.7 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:ruby-tcltk0:1.8.1-7.el4_8.3 · Red Hat:enterprise_linux:4::asPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

    If successful

    Confidentiality
    P · data can be read
    Integrity
    P · data or configuration can be modified
    Availability
    P · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    P
    Integrity impact
    P
    Availability impact
    P

    Weakness class (CWE)

    CWE-287 · Improper Authentication

    CVSS vector

    AV:N/AC:M/Au:N/C:P/I:P/A:P

    nvd-primary

    Root cause

    Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

    The bug in code

    The whole CWE-287 class

    A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

    Vulnerable

    ts
    app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

    Fixed

    ts
    const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Show all references (10 more)

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records