CVE-2019-9901

istio/envoy: Path traversal via URL Patch manipulation in HTTP/1.x header

Severity Score

10.0

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Envoy 1.9.0 and before does not normalize HTTP URL paths. A remote attacker may craft a relative path, e.g., something/../admin, to bypass access control, e.g., a block on /admin. A backend server could then interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.

Envoy versión 1.9.0 y anteriores no normalizan las path URL HTTP. Un atacante remoto puede crear un path relativo, por ejemplo, algo/.. /admin, para omitir el control de acceso, por ejemplo, un bloque en/admin. A continuación, un servidor back-end podría interpretar el path no normalizado y suministrar a un atacante acceso más allá del ámbito suministrado por la Directiva de control de acceso.

A flaw was found in Envoy version 1.9.0 and older, where Envoy does not normalize HTTP URL paths. This flaw allows a remote attacker to craft a path with a relative path and to bypass access control. This issue results in a backend server with the ability to interpret the unnormalized path.

Red Hat OpenShift Service Mesh is Red Hat's distribution of the Istio service mesh project, tailored for installation into an on-premise OpenShift Container Platform installation. Issues addressed include bypass and traversal vulnerabilities.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-03-21 CVE Reserved
2019-04-11 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-706: Use of Incorrectly-Resolved Name or Reference

CAPEC

References (6)

URL	Tag	Source
https://github.com/envoyproxy/envoy/issues/6435	Issue Tracking
https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w	X_refsource_confirm
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history	2023-11-07
https://access.redhat.com/security/cve/CVE-2019-9901	2019-04-10
https://bugzilla.redhat.com/show_bug.cgi?id=1698025	2019-04-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Envoyproxy Search vendor "Envoyproxy"		Envoy Search vendor "Envoyproxy" for product "Envoy"				<= 1.9.0 Search vendor "Envoyproxy" for product "Envoy" and version " <= 1.9.0"		-		Affected