Summary

Vulnerability in com.hotels.styx:styx-api (CVE-2020-6858). Data can be tampered with by attackers. Exploitable via com.hotels.styx.api.HttpHeaders.Builder. Mitigation: upgrade to 1.0.0-rc1 or later.

Original description

The description as published by the source.

Vulnerability

Styx is vulnerable to CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting').

Vulnerable Component

The vulnerable component is the com.hotels.styx.api.HttpHeaders.Builder due to disabling the HTTP Header validation built into Netty in these locations:

https://github.com/HotelsDotCom/styx/blob/e1d578e9b9c38df9cd19c21dc2eb9b949d85b558/components/api/src/main/java/com/hotels/styx/api/HttpHeaders.java#L145

new DefaultHttpHeaders(false) disables the built-in validation in Netty. Either use the default constructor or new DefaultHttpHeaders(true instead.

Additionally, another vulnerable component is the StyxToNettyResponseTranslator due to also disabling the HTTP Header validation built into netty in this location.

https://github.com/HotelsDotCom/styx/blob/8d60e5493e65d0d536afc0b350dcb02d24e0f7a7/components/server/src/main/java/com/hotels/styx/server/netty/connectors/StyxToNettyResponseTranslator.java#L30

DefaultHttpResponse nettyResponse = new DefaultHttpResponse(version, httpResponseStatus, false);
new DefaultHttpResponse(version, httpResponseStatus, false); disables the built-in validation in Netty. Please use the constructor new DefaultHttpResponse(version, httpResponseStatus, true);

Proof of Concept

The following test plugin proves that…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2020-6858 has been found in com.hotels.styx:styx-api.
Attackers can target a specific entry point like com.hotels.styx.api.HttpHeaders.Builder over the network to misuse the product.
Data can be tampered with by attackers.
What to do: upgrade com.hotels.styx:styx-api to 1.0.0-rc1 or later.
If unsure, ask your IT team or search "com.hotels.styx:styx-api CVE-2020-6858" on the vendor's site.

CVE-2020-6858 (com.hotels.styx:styx-api) — CWE-74
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: com.hotels.styx.api.HttpHeaders.Builder
Patched: 1.0.0-rc1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-74) exists in com.hotels.styx:styx-api. Attackers reach the vulnerable code path via com.hotels.styx.api.HttpHeaders.Builder without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of com.hotels.styx:styx-api. Attack surface: com.hotels.styx.api.HttpHeaders.Builder.

🔥 Severity

Severity: ?. Data can be tampered with by attackers.

🔧 How to fix

Update to 1.0.0-rc1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
Audit SBOM/dependencies for affected components.
```
資産台帳・SBOM・依存マニフェストで com.hotels.styx:styx-api を使っているサービスとバージョンを洗い出す。
2
Apply patch patch
```
Upgrade com.hotels.styx:styx-api to 1.0.0-rc1
```
ステージング環境で 1.0.0-rc1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Maven com.hotels.styx:styx-api

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.0-rc1"}]}]