PT-2019-15673 · Envoy · Envoy

Harvey Tuch · Published 2019-12-13 · Updated 2020-08-24 · CVE-2019-18801

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Envoy version 1.12.0

Description An issue allows an untrusted remote client to send HTTP/2 requests that can write to the heap outside of the request buffers when the upstream is HTTP/1. This can lead to corruption of nearby heap contents or bypass Envoy's access control mechanisms, such as path-based routing. An attacker may also modify requests from other users that are proximal in time and space.

Recommendations For Envoy version 1.12.0, consider disabling HTTP/2 support until a patch is available to prevent exploitation. Restrict access to sensitive paths and resources to minimize the risk of access control bypass. As a temporary workaround, monitor and limit proximal requests to reduce the risk of request modification. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2019-18801

GHSA-GXVV-X4P2-RPPP

RHSA-2019:4222

Affected Products

Envoy

References · 7

• 🔥 https://github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp · Exploit
• https://github.com/envoyproxy/envoy/commits/master · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2019-18801 · Security Note
• https://osv.dev/vulnerability/CVE-2019-18801 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2019:4222 · Note
• https://blog.envoyproxy.io · Note
• https://groups.google.com/forum/#%21forum/envoy-users · Note