CVE-2019-16782
Published: 18 December 2019
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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
ruby-rack Launchpad, Ubuntu, Debian |
bionic |
Released
(1.6.4-4ubuntu0.2+esm1)
Available with Ubuntu Pro |
| disco |
Ignored
(end of life)
|
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Released
(2.0.7-2ubuntu0.1+esm1)
Available with Ubuntu Pro |
|
| groovy |
Not vulnerable
(2.1.1-4)
|
|
| hirsute |
Not vulnerable
(2.1.1-4)
|
|
| impish |
Not vulnerable
(2.1.1-4)
|
|
| jammy |
Not vulnerable
(2.1.1-4)
|
|
| kinetic |
Not vulnerable
(2.1.1-4)
|
|
| lunar |
Not vulnerable
(2.1.1-4)
|
|
| mantic |
Not vulnerable
(2.1.1-4)
|
|
| trusty |
Released
(1.5.2-3+deb8u3ubuntu1~esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(1.6.12, 2.0.8)
|
|
| xenial |
Released
(1.6.4-3ubuntu0.2+esm1)
Available with Ubuntu Pro |
|
|
Patches: upstream: https://github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
References
- 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
- https://ubuntu.com/security/notices/USN-5253-1
- https://www.cve.org/CVERecord?id=CVE-2019-16782
- NVD
- Launchpad
- Debian