CVE-2019-18848: Json jwt JSON-jwt Gem Lacked Element Count Vulnerability
HIGHCVE-2019-18848 is a HIGH (CVSS 7.5) json-jwt gem lacked element count vulnerability (CWE-287: Improper Authentication) affecting Json jwt libraries in the RubyGems ecosystem. The issue involves json-jwt gem lacked element count during splitting of jwe string. Remediation is available by upgrading affected packages to version 1.11.0.
CVE-2019-18848 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
How to Fix CVE-2019-18848
To remediate this vulnerability, upgrade all affected Json jwt dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade json-jwt to 1.11.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for json-jwtHow to Check if You Are Affected
To determine whether your application is affected by CVE-2019-18848, inspect your project dependencies for Json jwt:
inspect dependencies for json-jwtAnalyze the terminal output to locate any version of Json jwt in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.0), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Json jwt, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2019-18848 Affected Json jwt Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
json-jwt
|
RubyGems |
< 1.11.0
|
1.11.0
|
References
Frequently Asked Questions
What is CVE-2019-18848?
Which Json jwt versions are affected?
What version fixes CVE-2019-18848?
Is json-jwt affected?
What is the CVSS score of CVE-2019-18848?
What CWE is associated with CVE-2019-18848?
How can I check RubyGems dependencies for CVE-2019-18848?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-cff7-6h4q-q5pj",
"modified" : "2023-08-25T23:33:30Z",
"published" : "2019-11-14T15:25:51Z",
"aliases" : [ "CVE-2019-18848" ],
"summary" : "JSON-jwt Gem lacked element count during splitting of JWE string",
"details" : "The json-jwt gem before 1.11.0 for Ruby lacks an element count during the splitting of a JWE string.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "RubyGems",
"name" : "json-jwt"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.11.0"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-18848"
}, {
"type" : "WEB",
"url" : "https://github.com/nov/json-jwt/commit/ada16e772906efdd035e3df49cb2ae372f0f948a"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/nov/json-jwt"
}, {
"type" : "WEB",
"url" : "https://github.com/nov/json-jwt/compare/v1.10.2...v1.11.0"
}, {
"type" : "WEB",
"url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/json-jwt/CVE-2019-18848.yml"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2020/10/msg00001.html"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-287" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2019-11-14T15:24:51Z",
"nvd_published_at" : "2019-11-12T15:15:00Z"
}
}