Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2011-2705

Severity CVSS v4.0:
Pending analysis
Type:
CWE-20 Input Validation
Publication date:
05/08/2011
Last modified:
11/04/2025

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.

Impact

Vector 2.0
AV:N/AC:L/Au:N/C:P/I:N/A:N CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): None
Availability (A): None

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* 1.8.7-334 (including)
cpe:2.3:a:ruby-lang:ruby:1.8.7:p22:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7:p71:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7:p72:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-160:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-173:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-248:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-249:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-299:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-302:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-330:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-p21:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.9:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.9:r18423:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.9.0:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools