CVE-2020-35470 Information disclosure in n/a
Envoy proxy logs incorrect downstream addresses when using TCP proxy filters, potentially exposing internal network topology information to attackers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-35470?
CVE-2020-35470 is a high-severity vulnerability in Envoyproxy Envoy, published on 15 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Envoy before 1.16.1 logs an incorrect downstream address because it considers only the directly connected peer, not the information in the proxy protocol header. This affects situations with tcp-proxy as the network filter (not HTTP filters).
Which versions are affected by CVE-2020-35470?
1 open source package ship an affected version, including envoy. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
envoy Bitnami | All versions | 1.16.1 |
Products include Envoyproxy Envoy.
How do I fix CVE-2020-35470?
Upgrade envoy to 1.16.1 or later.
Is CVE-2020-35470 being exploited?
There is no known exploitation of CVE-2020-35470 in the wild and no public exploit code.
Other vulnerabilities in Envoyproxy Envoy
- CVE-2022-29226 Trivial authentication bypass in Envoy
- CVE-2019-18801 Memory corruption in n/a
- CVE-2019-18802 Security feature bypass in n/a
- CVE-2024-23324 Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata
- CVE-2023-35941 Envoy vulnerable to OAuth2 credentials exploit with permanent validity
Sources
Also known as BIT-envoy-2020-35470, GHSA-rpv9-285j-r9jm.