### Impact Contour's [Cookie Rewriting](https://projectcontour.io/docs/1.33/config/cookie-rewriting/) feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify `HTTPProxy` resources can craft a malicious value in the following fields that results in arbitrary code execution in the Envoy proxy: - `spec.routes[].cookieRewritePolicies[].pathRewrite.value` - `spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value` The cookie rewriting feature is internally implemented using Envoy's [HTTP Lua filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter). User-controlled values are interpolated into Lua source code using Go `text/template` without sufficient sanitization. The injected code only executes when processing traffic on the attacker's own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also: - Read Envoy's xDS client credentials from the filesystem, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants. - Cause denial of service for other tenants sharing the Envoy instance. Other use cases of Lua filter are not vulnerable. ### Patches The fix is available in Contour [v1.33.4](https://github.com/projectcontour/contour/releases/tag/v1.33.4), [v1.32.5](https://github.com/projectcontour/contour/releases/tag/v1.32.5), and [v1.31.6](https://github.com/projectcontour/contour/releases/tag/v1.31.6). - v1.33.4: User-provided values are no longer interpolated into Lua code. Use of `text/template` is removed. Requires Envoy 1.35.0 or later. - v1.32.5, v1.31.6: User-provided values are escaped before interpolation into Lua code. ### Workarounds There are no workarounds. Users should upgrade to a patched version.
### Impact Contour's [Cookie Rewriting](https://projectcontour.io/docs/1.33/config/cookie-rewriting/) feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify `HTTPProxy` resources can craft a malicious value in the following fields that results in arbitrary code execution in the Envoy proxy: - `spec.routes[].cookieRewritePolicies[].pathRewrite.value` - `spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value` The cookie rewriting feature is internally implemented using Envoy's [HTTP Lua filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter). User-controlled values are interpolated into Lua source code using Go `text/template` without sufficient sanitization. The injected code only executes when processing traffic on the attacker's own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also: - Read Envoy's xDS client credentials from the filesystem, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants. - Cause denial of service for other tenants sharing the Envoy instance. Other use cases of Lua filter are not vulnerable. ### Patches The fix is available in Contour [v1.33.4](https://github.com/projectcontour/contour/releases/tag/v1.33.4), [v1.32.5](https://github.com/projectcontour/contour/releases/tag/v1.32.5), and [v1.31.6](https://github.com/projectcontour/contour/releases/tag/v1.31.6). - v1.33.4: User-provided values are no longer interpolated into Lua code. Use of `text/template` is removed. Requires Envoy 1.35.0 or later. - v1.32.5, v1.31.6: User-provided values are escaped before interpolation into Lua code. ### Workarounds There are no workarounds. Users should upgrade to a patched version.
Update github.com/projectcontour/contour to 1.31.6; github.com/projectcontour/contour to 1.32.5; github.com/projectcontour/contour to 1.33.4 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanContour has Lua code injection via Cookie Path Rewrite Policy affects github.com/projectcontour/contour (go), github.com/projectcontour/contour (go), github.com/projectcontour/contour (go). Severity is high. ### Impact Contour's [Cookie Rewriting](https://projectcontour.io/docs/1.33/config/cookie-rewriting/) feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify `HTTPProxy` resources can craft a malicious value in the following fields that results in arbitrary code execution in the Envoy proxy: - `spec.routes[].cookieRewritePolicies[].pathRewrite.value` - `spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value` The cookie rewriting feature is internally implemented using Envoy's [HTTP Lua filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter). User-controlled values are interpolated into Lua source code using Go `text/template` without sufficient sanitization. The injected code only executes when processing traffic on the attacker's own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also: - Read Envoy's xDS client credentials from the filesystem, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants. - Cause denial of service for other tenants sharing the Envoy instance. Other use cases of Lua filter are not vulnerable. ### Patches The fix is available in Contour [v1.33.4](https://github.com/projectcontour/contour/releases/tag/v1.33.4), [v1.32.5](https://github.com/projectcontour/contour/releases/tag/v1.32.5), and [v1.31.6](https://github.com/projectcontour/contour/releases/tag/v1.31.6). - v1.33.4: User-provided values are no longer interpolated into Lua code. Use of `text/template` is removed. Requires Envoy 1.35.0 or later. - v1.32.5, v1.31.6: User-provided values are escaped before interpolation into Lua code. ### Workarounds There are no workarounds. Users should upgrade to a patched version.
AI coding agents often install or upgrade packages automatically in go. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/projectcontour/contourgo | >=1.19.0,<1.31.6 | 1.31.6 |
| github.com/projectcontour/contourgo | >=1.32.0,<1.32.5 | 1.32.5 |
| github.com/projectcontour/contourgo | >=1.33.0,<1.33.4 | 1.33.4 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardUpdate github.com/projectcontour/contour to 1.31.6; github.com/projectcontour/contour to 1.32.5; github.com/projectcontour/contour to 1.33.4 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanContour has Lua code injection via Cookie Path Rewrite Policy affects github.com/projectcontour/contour (go), github.com/projectcontour/contour (go), github.com/projectcontour/contour (go). Severity is high. ### Impact Contour's [Cookie Rewriting](https://projectcontour.io/docs/1.33/config/cookie-rewriting/) feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify `HTTPProxy` resources can craft a malicious value in the following fields that results in arbitrary code execution in the Envoy proxy: - `spec.routes[].cookieRewritePolicies[].pathRewrite.value` - `spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value` The cookie rewriting feature is internally implemented using Envoy's [HTTP Lua filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter). User-controlled values are interpolated into Lua source code using Go `text/template` without sufficient sanitization. The injected code only executes when processing traffic on the attacker's own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also: - Read Envoy's xDS client credentials from the filesystem, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants. - Cause denial of service for other tenants sharing the Envoy instance. Other use cases of Lua filter are not vulnerable. ### Patches The fix is available in Contour [v1.33.4](https://github.com/projectcontour/contour/releases/tag/v1.33.4), [v1.32.5](https://github.com/projectcontour/contour/releases/tag/v1.32.5), and [v1.31.6](https://github.com/projectcontour/contour/releases/tag/v1.31.6). - v1.33.4: User-provided values are no longer interpolated into Lua code. Use of `text/template` is removed. Requires Envoy 1.35.0 or later. - v1.32.5, v1.31.6: User-provided values are escaped before interpolation into Lua code. ### Workarounds There are no workarounds. Users should upgrade to a patched version.
AI coding agents often install or upgrade packages automatically in go. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/projectcontour/contourgo | >=1.19.0,<1.31.6 | 1.31.6 |
| github.com/projectcontour/contourgo | >=1.32.0,<1.32.5 | 1.32.5 |
| github.com/projectcontour/contourgo | >=1.33.0,<1.33.4 | 1.33.4 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard