CVE-2021-43825: Use After Free
First published: Fri Feb 04 2022(Updated: )
Envoy is an open source edge and service proxy, designed for cloud-native applications. Sending a locally generated response must stop further processing of request or response data. Envoy tracks the amount of buffered request and response data and aborts the request if the amount of buffered data is over the limit by sending 413 or 500 responses. However when the buffer overflows while response is processed by the filter chain the operation may not be aborted correctly and result in accessing a freed memory block. If this happens Envoy will crash resulting in a denial of service.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/servicemesh-proxy | <0:2.0.9-3.el8 | 0:2.0.9-3.el8 |
| redhat/servicemesh-proxy | <0:2.1.2-4.el8 | 0:2.1.2-4.el8 |
| Envoyproxy Envoy | <1.18.6 | |
| Envoyproxy Envoy | >=1.19.0<1.19.3 | |
| Envoyproxy Envoy | >=1.20.0<1.20.2 | |
| Envoyproxy Envoy | >=1.21.0<1.21.1 |
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Reference Links
- https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh
- https://access.redhat.com/errata/RHSA-2022:1276
- https://access.redhat.com/errata/RHSA-2022:1275
- https://access.redhat.com/security/cve/cve-2021-43825
- https://bugzilla.redhat.com/show_bug.cgi?id=2050746
- https://www.cve.org/CVERecord?id=CVE-2021-43825 https://nvd.nist.gov/vuln/detail/CVE-2021-43825 https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh
Frequently Asked Questions
What is CVE-2021-43825?
CVE-2021-43825 is a vulnerability found in Envoy, an open-source edge and service proxy, that allows an attacker to cause a denial-of-service (DoS) condition by sending a large amount of buffered request and response data.
What is the severity of CVE-2021-43825?
The severity of CVE-2021-43825 is high, with a severity score of 7.5.
Which software versions are affected by CVE-2021-43825?
CVE-2021-43825 affects the following software versions: servicemesh-proxy 0:2.0.9-3.el8, servicemesh-proxy 0:2.1.2-4.el8, envoy 1.18.6, envoy 1.19.3, envoy 1.20.2, and envoy 1.21.1.
How can the CVE-2021-43825 vulnerability be fixed?
To fix the CVE-2021-43825 vulnerability, update affected software versions to the recommended or later versions: servicemesh-proxy 0:2.0.9-3.el8, servicemesh-proxy 0:2.1.2-4.el8, envoy 1.18.6, envoy 1.19.3, envoy 1.20.2, and envoy 1.21.1.
Where can I find more information about CVE-2021-43825?
More information about CVE-2021-43825 can be found on the following references: [Red Hat Advisory RHSA-2022:1276](https://access.redhat.com/errata/RHSA-2022:1276), [Red Hat Advisory RHSA-2022:1275](https://access.redhat.com/errata/RHSA-2022:1275), and [CVE-2021-43825](https://access.redhat.com/security/cve/cve-2021-43825).
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