CVE-2021-31810

Published: 13 July 2021

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).

Notes

Author	Note
leosilva	for xenial, the backport can be kind of intrusive. for now ignoring it.

Priority

Cvss 3 Severity Score

5.8

Score breakdown

Status

Package	Release	Status
ruby1.9.1 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	jammy	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	impish	Does not exist
ruby2.0 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	jammy	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	impish	Does not exist
ruby2.3 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	jammy	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Released (2.3.1-2~ubuntu16.04.16+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	impish	Does not exist
ruby2.5 Launchpad, Ubuntu, Debian	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	jammy	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	bionic	Released (2.5.1-1ubuntu1.10)
	impish	Does not exist
ruby2.7 Launchpad, Ubuntu, Debian	bionic	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
	focal	Released (2.7.0-5ubuntu1.5)
	groovy	Released (2.7.1-3ubuntu1.4)
	hirsute	Released (2.7.2-4ubuntu1.2)
	impish	Released (2.7.4-1ubuntu1)

Severity score breakdown

Parameter	Value
Base score	5.8
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

References

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