Vulnerability Monitor

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CVE-2011-2686

Ruby before 1.8.7-p352 does not reset the random seed upon forking, which makes it easier for context-dependent attackers to predict the values of random numbers by leveraging knowledge of the number sequence obtained in a different child process, a related issue to CVE-2003-0900. NOTE: this issue exists because of a regression during Ruby 1.8.6 development.

Security Impact Summary

CVE-2011-2686 is a security vulnerability that . Impacting 1 product from ruby-lang organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2011, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2011-08-05T21:55:04.467

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.0 (MEDIUM)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-310

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	ruby-lang	ruby	≤ 1.8.7-334	Yes
Application	ruby-lang	ruby	1.8.7	Yes
Application	ruby-lang	ruby	1.8.7	Yes
Application	ruby-lang	ruby	1.8.7	Yes
Application	ruby-lang	ruby	1.8.7-160	Yes
Application	ruby-lang	ruby	1.8.7-173	Yes
Application	ruby-lang	ruby	1.8.7-248	Yes
Application	ruby-lang	ruby	1.8.7-249	Yes
Application	ruby-lang	ruby	1.8.7-299	Yes
Application	ruby-lang	ruby	1.8.7-302	Yes
Application	ruby-lang	ruby	1.8.7-330	Yes
Application	ruby-lang	ruby	1.8.7-p21	Yes

References

http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063062.html Patch ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063071.html Patch ([email protected])
http://redmine.ruby-lang.org/issues/show/4338 ([email protected])
http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=31713 Patch ([email protected])
http://svn.ruby-lang.org/repos/ruby/tags/v1_8_7_352/ChangeLog ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/11/1 Patch ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/12/14 Patch ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/20/1 Patch ([email protected])
http://www.openwall.com/lists/oss-security/2011/07/20/16 Patch ([email protected])
http://www.ruby-lang.org/en/news/2011/07/02/ruby-1-8-7-p352-released/ Patch ([email protected])
http://www.securityfocus.com/bid/49015 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=722415 Patch ([email protected])
https://exchange.xforce.ibmcloud.com/vulnerabilities/69032 ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063062.html Patch (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063071.html Patch (af854a3a-2127-422b-91ae-364da2661108)
http://redmine.ruby-lang.org/issues/show/4338 (af854a3a-2127-422b-91ae-364da2661108)
http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=31713 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://svn.ruby-lang.org/repos/ruby/tags/v1_8_7_352/ChangeLog (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/11/1 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/12/14 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/20/1 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2011/07/20/16 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.ruby-lang.org/en/news/2011/07/02/ruby-1-8-7-p352-released/ Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/49015 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=722415 Patch (af854a3a-2127-422b-91ae-364da2661108)
https://exchange.xforce.ibmcloud.com/vulnerabilities/69032 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For ruby-lang's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.