PT-2019-2304 · Envoy · Envoy

Erlend Oftedal · Published 2019-04-05 · Updated 2022-05-24 · CVE-2019-9901

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Envoy versions 1.9.0 and earlier

Description The issue is related to errors in normalizing URI addresses. A remote attacker may exploit this by crafting a relative path, such as something/../admin, to bypass access control, for example, a block on /admin. This could allow an attacker to gain unauthorized access to protected data. A backend server could interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.

Recommendations For Envoy versions 1.9.0 and earlier, consider updating to a version that normalizes HTTP URL paths to prevent access control bypass. As a temporary workaround, restrict access to sensitive areas of the backend server to minimize the risk of exploitation. Avoid using relative paths in API endpoints until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Access Control

RCE

Weakness Enumeration

CWE-284

CWE-706

CWE-20

Related Identifiers

BDU:2019-02075

CVE-2019-9901

GHSA-2WMF-P7F8-W42H

GHSA-XCX5-93PW-JW2W

RHSA-2019:0741

Affected Products

Envoy

References · 16

• 🔥 https://github.com/envoyproxy/envoy/blob/main/security/postmortems/cve-2019-9900.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2019-9901 · Security Note
• https://bdu.fstec.ru/vul/2019-02075 · Security Note
• https://osv.dev/vulnerability/GHSA-2wmf-p7f8-w42h · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-9901 · Vendor Advisory
• https://envoyproxy.io/docs/envoy/v1.9.1/intro/version_history · Vendor Advisory
• https://github.com/envoyproxy/envoy · Note
• https://github.com/envoyproxy/envoy/issues/6435 · Note
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w · Note
• https://github.com/envoyproxy/envoy/commit/e668e669677e52a00d99652b5a260d1cedafdfa8 · Note
• https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM · Note
• https://access.redhat.com/errata/RHSA-2019:0741 · Note
• https://t.me/canyoupwnme/5402 · Telegram Post
• https://cvedetails.com/cve/CVE-2019-9901 · Note
• https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM · Note