Session hijackign in Ruby on Rails

1) Information Exposure Through Timing Discrepancy

EUVDB-ID: #VU23688

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16782

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a hijack victim's session.

The vulnerability exists due to an indexing issue in Rack (RubyGem rack) when processing user sessions. A remote attacker can guess session identifier and hijack victim's session.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ruby on Rails: 5.2.0 - 6.0.2

External links

http://github.com/rails/rails/releases/tag/v6.0.2.1
http://github.com/rails/rails/releases/tag/v5.2.4.1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.