PT-2019-14023 · Envoy · Envoy

Asraa · Published 2019-10-09 · Updated 2019-10-17 · CVE-2019-15226

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Envoy versions 1.10.0 through 1.11.1

Description The issue allows a remote attacker to craft a request that consumes CPU, resulting in a denial-of-service attack. This is due to the implementation having O(n^2) performance characteristics when verifying the total size of request headers. The attack can be performed by sending a request with many thousands of small headers, staying below the maximum request header size.

Recommendations For Envoy versions 1.10.0 through 1.11.1, consider updating to a version that addresses this performance issue to prevent denial-of-service attacks. As a temporary workaround, consider restricting the number of headers allowed in incoming requests to minimize the risk of exploitation.

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2019-15226

Affected Products

Envoy

References · 5

• https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014 · Patch
• https://osv.dev/vulnerability/CVE-2019-15226 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-15226 · Security Note
• https://github.com/envoyproxy/envoy/commits/master · Note
• https://github.com/envoyproxy/envoy/issues/8520 · Note