CVE-2021-31810 - Exposure of Resource to Wrong Sphere

Severity

57%

Complexity

39%

Confidentiality

23%

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 3.1 Base Score 5.8. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N).

Overview

First reported 3 years ago

2021-07-13 13:15:00

Last updated 3 years ago

2021-11-06 03:24:00

Affected Software

Debian Linux 9.0

9.0

References

https://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/

https://hackerone.com/reports/1145454

FEDORA-2021-36cdab1f8d

https://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/

Vendor Advisory

https://hackerone.com/reports/1145454

Exploit, Patch, Third Party Advisory

FEDORA-2021-36cdab1f8d

Mailing List, Third Party Advisory

https://security.netapp.com/advisory/ntap-20210917-0001/

[debian-lts-announce] 20211013 [SECURITY] [DLA 2780-1] ruby2.3 security update

https://security.netapp.com/advisory/ntap-20210917-0001/

Third Party Advisory

[debian-lts-announce] 20211013 [SECURITY] [DLA 2780-1] ruby2.3 security update

Mailing List, Third Party Advisory

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