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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.1.1-2 |
| sid | Fixed | 2.1.1-2 |
| forky | Fixed | 2.1.1-2 |
| bullseye | Fixed | 2.1.1-2 |
| bookworm | Fixed | 2.1.1-2 |
References
- https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3
- https://www.suse.com/security/cve/CVE-2019-16782.html
- https://nvd.nist.gov/vuln/detail/CVE-2019-16782
- https://github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38
- https://github.com/rack/rack
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2019-16782.yml
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HZXMWILCICQLA2BYSP6I2CRMUG53YBLX
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HZXMWILCICQLA2BYSP6I2CRMUG53YBLX
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00016.html
- 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
- http://www.openwall.com/lists/oss-security/2020/04/08/1
- http://www.openwall.com/lists/oss-security/2020/04/09/2
- https://security-tracker.debian.org/tracker/CVE-2019-16782
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.