CVE-2021-43826: Use After Free
First published: Fri Feb 04 2022(Updated: )
Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 | |
| 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 |
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Reference Links
- https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
- https://access.redhat.com/errata/RHSA-2022:1276
- https://access.redhat.com/errata/RHSA-2022:1275
- https://access.redhat.com/security/cve/cve-2021-43826
- https://bugzilla.redhat.com/show_bug.cgi?id=2050748
- https://www.cve.org/CVERecord?id=CVE-2021-43826 https://nvd.nist.gov/vuln/detail/CVE-2021-43826 https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf
Frequently Asked Questions
What is CVE-2021-43826?
CVE-2021-43826 is a vulnerability in Envoy that can result in a crash when configured for upstream tunneling and the downstream connection disconnects.
How severe is CVE-2021-43826?
CVE-2021-43826 has a severity rating of 7.5 (high).
Which software versions are affected by CVE-2021-43826?
CVE-2021-43826 affects versions up to and excluding 1.18.6, 1.19.3, 1.20.2, and 1.21.1 of Envoy.
How can I fix CVE-2021-43826?
To fix CVE-2021-43826, update your Envoy installation to version 1.18.6, 1.19.3, 1.20.2, or 1.21.1.
Where can I find more information about CVE-2021-43826?
You can find more information about CVE-2021-43826 on the Red Hat Security Advisory page and the official CVE page.
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