Multiple vulnerabilities in Ruby



Published: 2021-08-02
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-31810
CVE-2021-32066
CWE-ID CWE-200
CWE-295
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Ruby
Universal components / Libraries / Scripting languages

Vendor Ruby

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU55488

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-31810

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists within Net::FTP in Ruby when processing PASV responses. A remote attacker can trick the victim to connect to a malicious FTP server and 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).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ruby: 2.6.0 - 3.0.1


CPE2.3 External links

http://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/
http://hackerone.com/reports/1145454
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Improper Certificate Validation

EUVDB-ID: #VU55489

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-32066

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists in Net::IMAP in Ruby, due to the gem does not raise an exception when StartTLS fails with an an unknown response. A remote attacker can perform a man-in-the-middle (MitM) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ruby: 2.6.0 - 3.0.1


CPE2.3 External links

http://github.com/ruby/ruby/commit/a21a3b7d23704a01d34bd79d09dc37897e00922a
http://www.ruby-lang.org/en/news/2021/07/07/starttls-stripping-in-net-imap/
http://hackerone.com/reports/1178562

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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