CVE-2020-5249
What it is
In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account, but needs a user to act. Limited direct impact.
- Exploit odds
- 1.6% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 1.6% in the next 30 days (EPSS).
- Severity: 6.5 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 1.6% · EPSS, next 30 days
- Weakness
- CWE-113
- Record status
- Modified
Affected
- Puma ≤ 3.12.3
- Puma ≤ 4.3.2
Attack profile CVSS 3.1 · 6.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2020-5249.md and follow it. Check whether this project is affected by CVE-2020-5249. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3
- https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58
- https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v
- https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3
- https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58
- https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v
References
- https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3
- https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58
- https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/
- https://owasp.org/www-community/attacks/HTTP_Response_Splitting
- https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3
- https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58
- https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/
- https://owasp.org/www-community/attacks/HTTP_Response_Splitting