Rack up to 1.6.11/2.0.7 Session timing discrepancy

Summaryinfo

A vulnerability identified as critical has been detected in Rack up to 1.6.11/2.0.7. This affects an unknown function of the component Session Handler. The manipulation leads to timing discrepancy. This vulnerability is referenced as CVE-2019-16782. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Rack up to 1.6.11/2.0.7. This issue affects some unknown functionality of the component Session Handler. The manipulation with an unknown input leads to a timing discrepancy vulnerability. Using CWE to declare the problem leads to CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

There's a possible information leak / session hijack vulnerability in Rack (RubyGem rack). This vulnerability is patched in versions 1.6.12 and 2.0.8. Attackers may be able to find and hijack sessions by using timing attacks targeting the session id. Session ids are usually stored and indexed in a database that uses some kind of scheme for speeding up lookups of that session id. By carefully measuring the amount of time it takes to look up a session, an attacker may be able to find a valid session id and hijack the session. The session id itself may be generated randomly, but the way the session is indexed by the backing store does not use a secure comparison.

The weakness was published 12/18/2019. The identification of this vulnerability is CVE-2019-16782. The exploitation is known to be difficult. The attack may be initiated remotely. A simple authentication is required for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 1.6.12 or 2.0.8 eliminates this vulnerability.

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Productinfo

Name

• Rack

Version

• 1.6.0
• 1.6.1
• 1.6.2
• 1.6.3
• 1.6.4
• 1.6.5
• 1.6.6
• 1.6.7
• 1.6.8
• 1.6.9
• 1.6.10
• 1.6.11
• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7

License

• open-source

Website

• Product: https://github.com/rack/rack/

CPE 2.3info

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CPE 2.2info

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