Prototype Pollution in Openjsf Express
CVE-2022-24999
qs before 6.10.3, as used in Express before 4.17.3 and other products, allows attackers to cause a Node process hang for an Express application because an __ proto__ key can be used. In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000. The fix was backported to qs 6.9.7, 6.8.3, 6.7.3, 6.6.1, 6.5.3, 6.4.1, 6.3.3, and 6.2.4 (and therefore Express 4.17.3, which has "deps: qs@6.9.7" in its release description, is not vulnerable).
Vulnerability class: Prototype Pollution
EPSS: 0.147 (96.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Openjsf Express
- Qs_project Qs — versions 6.4.0, 6.6.0
- Debian Debian_linux — versions 10.0
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Release Notes)
- cve@mitre.org (Patch, Issue Tracking)
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (mailing-list, Mailing List, Third Party Advisory)
- cve@mitre.org
Frequently asked questions
- What is CVE-2022-24999?
- CVE-2022-24999 is a high-severity vulnerability in Openjsf Express, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2022-11-26.
- How severe is CVE-2022-24999?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-24999 known to be exploited?
- 33 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.