CVE-2019-16782

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.

How to fix CVE-2019-16782

To remediate CVE-2019-16782, upgrade the affected package to a fixed version below.

• —upgrade to 2.1.1-2 or later
• —upgrade to 1.6.12 or later

Is CVE-2019-16782 being exploited?

Low — EPSS is 0.9%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 2.1.1-2
• from 0, < 1.6.12

CVSS scores

References (14)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2019-16782
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-16782
• PATCHgithub.com/rack/rack
• WEBlists.opensuse.org/opensuse-security-announce/2020-02/msg00016.html