National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-16782 Detail

Current Description

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.

Source:  MITRE
View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score: 5.9 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Nist CVSS score does not match with CNA score
CNA:  security-advisories@github.com
Base Score: 6.3 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2019/12/18/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/12/18/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2019/12/19/3 Mailing List Third Party Advisory
https://github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38 Patch Third Party Advisory
https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HZXMWILCICQLA2BYSP6I2CRMUG53YBLX/

Weakness Enumeration

CWE-ID CWE Name Source
CWE-200 Information Exposure NIST  
CWE-208 Information Exposure Through Timing Discrepancy security-advisories@github.com  

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:rack_project:rack:1.6.12:*:*:*:*:ruby:*:*
     Show Matching CPE(s)
 cpe:2.3:a:rack_project:rack:2.0.8:*:*:*:*:ruby:*:*
     Show Matching CPE(s)


Change History

4 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-16782
NVD Published Date:
12/18/2019
NVD Last Modified:
01/18/2020