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
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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31810
- https://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/
- https://github.com/ruby/ruby/commit/3ca1399150ed4eacfd2fe1ee251b966f8d1ee469 (2.7)
- https://hackerone.com/reports/1145454
- https://ubuntu.com/security/notices/USN-5020-1
- NVD
- Launchpad
- Debian