CVE-2021-43824: Null Pointer Dereference
First published: Fri Feb 04 2022(Updated: )
Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.
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/9371333230b1a6e1be2eccf4868771e11af6253a
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p
- https://access.redhat.com/errata/RHSA-2022:1276
- https://access.redhat.com/errata/RHSA-2022:1275
- https://access.redhat.com/security/cve/cve-2021-43824
- https://bugzilla.redhat.com/show_bug.cgi?id=2050744
- https://www.cve.org/CVERecord?id=CVE-2021-43824 https://nvd.nist.gov/vuln/detail/CVE-2021-43824 https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p
Frequently Asked Questions
What is CVE-2021-43824?
CVE-2021-43824 is a vulnerability found in Envoy that can trigger a NULL pointer dereference and cause a denial of service attack.
How does CVE-2021-43824 affect Envoy?
CVE-2021-43824 affects Envoy when a CONNECT request is sent to the JWT filter configured with regex match, causing Envoy to crash.
What is the severity of CVE-2021-43824?
CVE-2021-43824 has a severity rating of high.
How can I fix CVE-2021-43824?
To fix CVE-2021-43824, you should update to the latest version of Envoy or servicemesh-proxy that includes the necessary fixes.
Where can I find more information about CVE-2021-43824?
You can find more information about CVE-2021-43824 on the official CVE page, NVD, GitHub security advisories, Bugzilla, and Red Hat errata.
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