Information Exposure Affecting ruby:2.5/rubygem-net-telnet package, versions <0:0.1.1-109.module+el8.5.0+14275+d9c243ca


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
1% (85th percentile)

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  • Snyk IDSNYK-RHEL8-RUBY-4995672
  • published26 Jul 2021
  • disclosed7 Jul 2021

Introduced: 7 Jul 2021

CVE-2021-31810  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade RHEL:8 ruby:2.5/rubygem-net-telnet to version 0:0.1.1-109.module+el8.5.0+14275+d9c243ca or higher.
This issue was patched in RHSA-2022:0672.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby:2.5/rubygem-net-telnet package and not the ruby:2.5/rubygem-net-telnet package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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).

CVSS Scores

version 3.1