CVSS score 8.6 (High), Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
After Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block.
Impact
Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter.
Attack Vector
A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies.
Patches
Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response.
Workarounds
Disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.
Credits
Raul Gutierrez Segales rgs@pinterest.com
References
https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/releases
For more information
If you have any questions or comments about this advisory:
Open an issue in Envoy repo
Email us at envoy-security
rgs1 Analyst
CVSS score 8.6 (High), Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
After Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block.
Impact
Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter.
Attack Vector
A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies.
Patches
Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response.
Workarounds
Disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.
Credits
Raul Gutierrez Segales rgs@pinterest.com
References
https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/releases
For more information
If you have any questions or comments about this advisory:
Open an issue in Envoy repo
Email us at envoy-security