| Name | CVE-2020-5249 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 953122 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| puma (PTS) | stretch (security), stretch (lts), stretch | 3.6.0-1+deb9u2 | fixed |
| buster (security), buster, buster (lts) | 3.12.0-2+deb10u3 | fixed | |
| bullseye | 4.3.8-1+deb11u2 | fixed | |
| bullseye (security) | 4.3.8-1+deb11u3 | fixed | |
| bookworm | 5.6.5-3 | fixed | |
| sid, trixie | 6.4.3-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| puma | source | stretch | (not affected) | |||
| puma | source | buster | 3.12.0-2+deb10u2 | |||
| puma | source | (unstable) | 3.12.4-1 | 953122 |
[stretch] - puma <not-affected> (early_hint feature added in later version)
https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58
https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3