CVE-2021-31810

2021-07-1300:00:00

ubuntu.com

5.8 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.007 Low

EPSS

Percentile

80.1%

JSON

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.

OSVersionArchitecturePackageVersionFilename
ubuntu16.04noarchruby2.3< 2.3.1-2~ubuntu16.04.16+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchruby2.5< 2.5.1-1ubuntu1.10UNKNOWN
ubuntu20.04noarchruby2.7< 2.7.0-5ubuntu1.5UNKNOWN
ubuntu20.10noarchruby2.7< 2.7.1-3ubuntu1.4UNKNOWN
ubuntu21.04noarchruby2.7< 2.7.2-4ubuntu1.2UNKNOWN
ubuntu21.10noarchruby2.7< 2.7.4-1ubuntu1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	16.04	noarch	ruby2.3	< 2.3.1-2~ubuntu16.04.16+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	18.04	noarch	ruby2.5	< 2.5.1-1ubuntu1.10	UNKNOWN
ubuntu	20.04	noarch	ruby2.7	< 2.7.0-5ubuntu1.5	UNKNOWN
ubuntu	20.10	noarch	ruby2.7	< 2.7.1-3ubuntu1.4	UNKNOWN
ubuntu	21.04	noarch	ruby2.7	< 2.7.2-4ubuntu1.2	UNKNOWN
ubuntu	21.10	noarch	ruby2.7	< 2.7.4-1ubuntu1	UNKNOWN