rack: Access Confidential Data -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0029
          rack -- information leak / session hijack vulnerability
                              2 January 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           rack
Publisher:         FreeBSD
Operating System:  FreeBSD
Impact/Access:     Access Confidential Data -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-16782  

Original Bulletin: 
   http://www.vuxml.org/freebsd/66e4dc99-28b3-11ea-8dde-08002728f74c.html

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FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports 
Collection

rack -- information leak / session hijack vulnerability

Affected packages

2.0.0 <= rubygem-rack < 2.0.8,3
1.6.0 <= rubygem-rack16 < 1.6.12

Details

VuXML ID 66e4dc99-28b3-11ea-8dde-08002728f74c

Discovery 2019-12-08

Entry 2019-12-29

National Vulnerability Database:

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.

References

CVE Name CVE-2019-16782

URL https://github.com/rack/rack/blob/master/CHANGELOG.md
URL https://nvd.nist.gov/vuln/detail/CVE-2019-16782

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