PT-2019-5283 · Envoy · Envoy

Yuchen Dai · Published 2019-10-23 · Updated 2019-11-12 · CVE-2019-18836

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 version 1.12.0

Description The issue is related to a remote denial of service caused by resource loops. This can be triggered by a single idle TCP connection, which can keep a worker thread in an infinite busy loop when continue on listener filters timeout is used. The vulnerability can be exploited by providing specific input, allowing an attacker to cause a denial of service.

Recommendations For Envoy version 1.12.0, consider disabling the use of continue on listener filters timeout to prevent the worker thread from entering an infinite busy loop as a temporary workaround. Restrict access to the affected module to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

BDU:2020-02184

CVE-2019-18836

GHSA-3XVF-4396-CJ46

Affected Products

Envoy

References · 8

• 🔥 https://github.com/istio/istio/issues/18229 · Exploit
• 🔥 https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xvf-4396-cj46 · Exploit
• https://osv.dev/vulnerability/CVE-2019-18836 · Vendor Advisory
• https://blog.envoyproxy.io · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-02184 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-18836 · Security Note
• https://access.redhat.com/security/cve/cve-2019-18836 · Note
• https://groups.google.com/forum/#%21forum/envoy-users · Note