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CVE-2011-2705

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x...

5.0 Medium

CVE-2011-2705 is a medium vulnerability (CVSS 5.0) in Ruby-lang Ruby, published August 5, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.25%, the 83rd percentile. No source names a fixed version.

What does this mean?
Severity
5.0 MediumCVSS 2.0, NVD
Exploit chance
2.25%EPSS, 83rd percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

Description

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

Exploit likelihood

2.25%Down 0.4 points since Feb 4, 2022
90%50%10%1%

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ruby1.9.1
Debian:6.0
From an advisory covering 6 CVEs
before 1.9.2.0-2+deb6u4, plus listed versions
1.9.2.0-21.9.2.0-2+armhf
1.9.2.0-2+deb6u4
ruby1.8
Debian:6.0
From an advisory covering 6 CVEs
before 1.8.7.302-2squeeze3, plus listed versions
1.8.7.302-21.8.7.302-2squeeze11.8.7.302-2squeeze2
1.8.7.302-2squeeze3
ruby
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-debuginfo
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-devel
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-docs
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-rdoc
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-ri
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-static
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-tcltk
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
Show 50 moreShow less
Affected packages
PackageAffectedFixed
ruby-irb
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-libs
Red Hat:enterprise_linux:6::client
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-debuginfo
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-devel
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-docs
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-rdoc
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-ri
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-static
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-tcltk
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-irb
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-libs
Red Hat:enterprise_linux:6::computenode
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-debuginfo
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-devel
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-docs
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-rdoc
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-ri
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-static
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-tcltk
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-irb
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-libs
Red Hat:enterprise_linux:6::server
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-debuginfo
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-devel
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-docs
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-rdoc
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-ri
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-static
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-tcltk
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-irb
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby-libs
Red Hat:enterprise_linux:6::workstation
From an advisory covering 2 CVEs
before 0:1.8.7.352-3.el6
0:1.8.7.352-3.el6
ruby3.3
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-bundled-gems
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-default-gems
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-devel
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-doc
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-libs
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.4
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-bundled-gems
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-default-gems
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-devel
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-doc
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-libs
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby4.0
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-bundled-gems
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-default-gems
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-devel
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-doc
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-libs
Red Hat:hummingbird:1
From an advisory covering 36 CVEs
before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1

What each source reports

NVD Score used5.0

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

Record
CVE-2011-2705
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-20
Updated
2026-11-02
CVE ListNo score

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

Record
CVE-2011-2705
Updated
2026-11-02
EUVDEUVD-2011-2686No score

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

Record
EUVD-2011-2686
Updated
2026-11-03
GitHub AdvisoriesGHSA-wj5x-c2v9-7wwrNo score

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x...

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

Record
GHSA-wj5x-c2v9-7wwr
Weakness
CWE-20
Updated
2026-11-02
OSVRHSA-2026:73057.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:7305
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:73077.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:7307
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:88387.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:8838
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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