Vulnerability Details : 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.
Products affected by CVE-2019-16782
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:a:rack_project:rack:*:*:*:*:*:ruby:*:*
- cpe:2.3:a:rack_project:rack:*:*:*:*:*:ruby:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-16782
0.25%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 64 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-16782
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
2.2
|
3.6
|
NIST | |
6.3
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N |
1.8
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2019-16782
-
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.Assigned by: nvd@nist.gov (Primary)
-
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2019-16782
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http://www.openwall.com/lists/oss-security/2019/12/18/3
oss-security - Re: [CVE-2019-16782] Possible Information Leak / Session Hijack Vulnerability in RackMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2019/12/18/2
oss-security - [CVE-2019-16782] Possible Information Leak / Session Hijack Vulnerability in RackMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2019/12/19/3
oss-security - Re: [CVE-2019-16782] Possible Information Leak / Session Hijack Vulnerability in RackMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/04/08/1
oss-security - Re: [CVE-2019-16782] Possible Information Leak / Session Hijack Vulnerability in RackMailing List;Patch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HZXMWILCICQLA2BYSP6I2CRMUG53YBLX/
[SECURITY] Fedora 31 Update: rubygem-rack-2.0.8-1.fc31 - package-announce - Fedora Mailing-ListsThird Party Advisory
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http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00016.html
[security-announce] openSUSE-SU-2020:0214-1: moderate: Security update fThird Party Advisory
-
https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3
Possible Information Leak / Session Hijack Vulnerability · Advisory · rack/rack · GitHubThird Party Advisory
-
http://www.openwall.com/lists/oss-security/2020/04/09/2
oss-security - Re: [CVE-2019-16782] Possible Information Leak / Session Hijack Vulnerability in RackMailing List;Third Party Advisory
-
https://github.com/rack/rack/commit/7fecaee81f59926b6e1913511c90650e76673b38
Merge branch 'advisory-fix-1' · rack/rack@7fecaee · GitHubPatch;Third Party Advisory
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