Candidate: CVE-2019-16782
PublicDate: 2019-12-18 20:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16782
 https://github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38
 https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3
 http://www.openwall.com/lists/oss-security/2019/12/18/2
 http://www.openwall.com/lists/oss-security/2019/12/18/3
 http://www.openwall.com/lists/oss-security/2019/12/19/3
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.
Ubuntu-Description:
Notes:
Mitigation:
Bugs:
 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=946983
Priority: medium
Discovered-by:
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N [5.9 MEDIUM]


Patches_ruby-rack:
 upstream: https://github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38
upstream_ruby-rack: needs-triage
precise/esm_ruby-rack: DNE
trusty_ruby-rack: ignored (out of standard support)
trusty/esm_ruby-rack: needed
xenial_ruby-rack: ignored (end of standard support, was needed)
bionic_ruby-rack: needed
disco_ruby-rack: ignored (reached end-of-life)
eoan_ruby-rack: ignored (reached end-of-life)
focal_ruby-rack: needed
groovy_ruby-rack: not-affected (2.1.1-4)
hirsute_ruby-rack: not-affected (2.1.1-4)
impish_ruby-rack: not-affected (2.1.1-4)
jammy_ruby-rack: not-affected (2.1.1-4)
devel_ruby-rack: not-affected (2.1.1-4)