CVE-2019-17190

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Summary

CVECVE-2019-17190
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-01-27 16:15:00 UTC
Updated2023-01-31 20:55:00 UTC
DescriptionA Local Privilege Escalation issue was discovered in Avast Secure Browser 76.0.1659.101. The vulnerability is due to an insecure ACL set by the AvastBrowserUpdate.exe (which is running as NT AUTHORITY\SYSTEM) when AvastSecureBrowser.exe checks for new updates. When the update check is triggered, the elevated process cleans the ACL of the Update.ini file in %PROGRAMDATA%\Avast Software\Browser\Update\ and sets all privileges to group Everyone. Because any low-privileged user can create, delete, or modify the Update.ini file stored in this location, an attacker with low privileges can create a hard link named Update.ini in this folder, and make it point to a file writable by NT AUTHORITY\SYSTEM. Once AvastBrowserUpdate.exe is triggered by the update check functionality, the DACL is set to a misconfigured value on the crafted Update.ini and, consequently, to the target file that was previously not writable by the low-privileged attacker.

Risk And Classification

Problem Types: CWE-863

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Avast Secure Browser 76.0.1659.101 All All All
Application Avast Secure Browser 76.0.1659.101 All All All

References

ReferenceSourceLinkTags
Avast Press | A tribute to our security research community MISC www.avast.com Vendor Advisory
Avast Secure Browser 76.0.1659.101 Local Privilege Escalation ≈ Packet Storm MISC packetstormsecurity.com
Full Disclosure: LPE in Avast Secure Browser FULLDISC seclists.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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