Ruby
CVE-2021-31810
MEDIUM
Vulnerability Assessment
| Impact | CVSS score of 5.8 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system. |
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Alert meAnalysisAI
An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Rated medium severity (CVSS 5.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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Technical ContextAI · show details
An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions). Affected products include: Ruby-Lang Ruby, Debian Debian Linux, Oracle Jd Edwards Enterpriseone Tools. Version information: through 2.6.7.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions).
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)NVD
Ruby before 2.4.3 allows Net::FTP command injection. Rated high severity (CVSS 8.8), this vulnerability is remotely expl
The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injectio
Ruby 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
Type confusion exists in two methods of Ruby's WIN32OLE class, ole_invoke and ole_query_interface. Rated critical severi
Authenticated remote code execution in OpenC3 COSMOS (Ruby gem 'openc3' versions 5.1.0 through 7.2.1) lets any logged-in
Type confusion exists in _cancel_eval Ruby's TclTkIp class method. Rated critical severity (CVSS 9.8), this vulnerabilit
An exploitable heap overflow vulnerability exists in the Fiddle::Function.new "initialize" function functionality of Rub
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7
Stored XSS in Bugsink error tracking tool before 2.0.13 allows unauthenticated attackers to inject persistent scripts th
Ruby before 2.4.2, 2.3.5, and 2.2.8 is vulnerable to a malicious format string which contains a precious specifier (*) w
Heap-based buffer overflow in Ruby 1.8, 1.9 before 1.9.3-p484, 2.0 before 2.0.0-p353, 2.1 before 2.1.0 preview2, and tru
Heap-use-after-free in the Ruby json gem's native C extension (versions 2.20.0 through 2.21.1) allows an unauthenticated
GitHub PoC
Exploit-DB