Vulnerability in Rack
CVE-2019-16782
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 · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.037 (89.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000
Affected products
- Rack — versions before 1.6.12 or 2.0.8
- Fedoraproject Fedora — versions 31
- openSUSE Leap — versions 15.1
Weakness classification (CWE)
References
- github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3 (Third Party Advisory)
- github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38 (Patch, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/12/18/3 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/12/18/2 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/12/19/3 (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2020-02/msg00016.html (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/04/08/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/04/09/2 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-16782?
- CVE-2019-16782 is a medium-severity vulnerability in Rack, classified under CWE-208. CVSS score: 6.3/10. Published 2019-12-18.
- How severe is CVE-2019-16782?
- Medium severity. CVSS v3 base score is 6.3 out of 10.