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CVE-2019-20627

CVE-2019-20627: AutoUpdater.NET allows XXE

9.8

CVSS Score
3.1

Basic Information

CVE ID
CVE-2019-20627
GHSA ID
GHSA-75p2-hgw4-g7f7
EPSS Score
0.62562%
CWE
CWE-611
Published
5/24/2022
Updated
9/26/2023
KEV Status
No
Technology
TechnologyC#

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Package NameEcosystemVulnerable VersionsFirst Patched Version
Autoupdater.NET.Officialnuget< 1.5.81.5.8

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from insecure XML parsing in the auto-update mechanism. The commit 1dc25f2 shows the fix explicitly sets XmlResolver=null when creating the XmlDocument in BackgroundWorkerDoWork. Prior to this patch, the XmlDocument default resolver was active, enabling XXE. The affected code path processes untrusted XML from update servers, making this the clear vulnerability source.

Vulnerable functions

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

WAF Protection Rules

WAF Rule

*utoUp**t*r.*s in *utoUp**t*r.N*T ***or* *.*.* *llows XX*.

Reasoning

T** vuln*r**ility st*ms *rom ins**ur* XML p*rsin* in t** *uto-up**t* m****nism. T** *ommit ******* s*ows t** *ix *xpli*itly s*ts `XmlR*solv*r=null` w**n *r**tin* t** `Xml*o*um*nt` in `***k*roun*Work*r*oWork`. Prior to t*is p*t**, t** `Xml*o*um*nt` **