Home/CVE/Ruby before 1.8.7-p352 does not reset the random seed upon forking, which makes it easier for context-dependent attacker
CVE

CVE-2011-2686

Ruby before 1.8.7-p352 does not reset the random seed upon forking, which makes it easier for context-dependent attacker

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.

MEDIUM · CVSS 5 EPSS 0.00801
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules3 YARA rules0
▤

Affected Products & Versions

2
ruby-lang ruby<= 1.8.7-334
ruby-lang rubyall versions
◈

Sigma Hunt Rules

3
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumRuby on Rails Framework Exceptions
productmediumPotential Ruby Reverse Shell
productmediumRuby Inline Command Execution
▣

Scoring & Timeline

5
MEDIUM · CVSS v2 (legacy) · secalert@redhat.com
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Published to NVD05 Aug 2011 · 09:55 PM
⚑

Vendor Advisories

4
rhsaRHSA-2026:7307Moderate
rhsaRHSA-2026:8838Moderate
rhsaRHSA-2026:7305Moderate
usnUSN-1377-1
🔗

References & Sources

13
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063062.htmlPatch
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/063071.htmlPatch
http://redmine.ruby-lang.org/issues/show/4338
http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=31713Patch
http://svn.ruby-lang.org/repos/ruby/tags/v1_8_7_352/ChangeLog
http://www.openwall.com/lists/oss-security/2011/07/11/1Patch
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