THREATPORT/VULNERABILITY/CVE-2019-16782
MEDIUM SEVERITY

CVE-2019-16782

Rack vulnerability

CVSS
6.3
EPSS
3.7%
EPSS pct
89th
Exploited
No known
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.
Affected vendor
Rack
Affected product
Rack
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness type (CWE)
Published
2019-12-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2019-16782

  • Confirm whether Rack Rack is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-16782.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-16782

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-16782 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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