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.
Published 2019-12-18 20:15:16
Updated 2021-11-02 18:04:04
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2019-16782

Exploit prediction scoring system (EPSS) score for CVE-2019-16782

0.25%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 64 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-16782

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.3
MEDIUM AV:N/AC:M/Au:N/C:P/I:N/A:N
8.6
2.9
NIST
5.9
MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.2
3.6
NIST
6.3
MEDIUM CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
1.8
4.0
GitHub, Inc.

CWE ids for CVE-2019-16782

  • The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
    Assigned by: nvd@nist.gov (Primary)
  • 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.
    Assigned by: security-advisories@github.com (Secondary)

References for CVE-2019-16782

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