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CVE-2019-18817

CVE-2019-18817: Istio vulnerable to denial of service

7.5

CVSS Score
3.1

Basic Information

CVE ID
CVE-2019-18817
GHSA ID
GHSA-vc7h-cmp3-4hw5
EPSS Score
0.66529%
CWE
CWE-835
Published
5/24/2022
Updated
10/19/2023
KEV Status
No
Technology
TechnologyGo

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Package NameEcosystemVulnerable VersionsFirst Patched Version
istio.io/istiogo>= 1.3.0, < 1.3.51.3.5

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from panic-induced crash loops (CWE-835) in Istio's control plane. The identified functions contained unhandled panic conditions when generating invalid xDS configurations. These panics would cause Pilot to crash repeatedly, creating an infinite restart loop (denial of service). The patch removed panic statements and added recovery mechanisms in parent functions (Apply*Patches), demonstrating these were the failure points. The connection to CVE-2019-18836's continue_on_listener_filters_timeout suggests these validation failures could be triggered by specific timeout-related configurations.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

Istio *.*.x ***or* *.*.* is vuln*r**l* to **ni*l o* s*rvi** ****us* `*ontinu*_on_list*n*r_*ilt*rs_tim*out` is s*t to Tru*, * r*l*t** issu* to *V*-****-*****.

Reasoning

T** vuln*r**ility st*ms *rom p*ni*-in*u*** *r*s* loops (*W*-***) in Istio's *ontrol pl*n*. T** i**nti*i** *un*tions *ont*in** un**n*l** p*ni* *on*itions w**n **n*r*tin* inv*li* x*S *on*i*ur*tions. T**s* p*ni*s woul* **us* Pilot to *r*s* r*p**t**ly, *