CVSS: 7.8EPSS: 0%CPEs: 1EXPL: 0CVE-2019-17190
https://notcve.org/view.php?id=CVE-2019-17190
A 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. • http://packetstormsecurity.com/files/156844/Avast-Secure-Browser-76.0.1659.101-Local-Privilege-Escalation.html http://seclists.org/fulldisclosure/2020/Mar/25 https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community • CWE-863: Incorrect Authorization •
CVSS: 9.3EPSS: 0%CPEs: 1EXPL: 1CVE-2019-18894
https://notcve.org/view.php?id=CVE-2019-18894
In Avast Premium Security 19.8.2393, attackers can send a specially crafted request to the local web server run by Avast Antivirus on port 27275 to support Bank Mode functionality. A flaw in the processing of a command allows execution of arbitrary OS commands with the privileges of the currently logged in user. This allows for example attackers who compromised a browser extension to escape from the browser sandbox. En Avast Premium Security versión 19.8.2393, los atacantes pueden enviar una petición especialmente diseñada hacia el servidor web local ejecutado por Avast Antivirus en el puerto 27275 para admitir la funcionalidad Bank Mode. Un fallo en el procesamiento de un comando permite una ejecución de comandos de Sistema Operativo arbitrarios con los privilegios del usuario actualmente conectado. • https://palant.de/2020/01/13/pwning-avast-secure-browser-for-fun-and-profit • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •
CVSS: 6.1EPSS: 0%CPEs: 3EXPL: 1CVE-2019-18893
https://notcve.org/view.php?id=CVE-2019-18893
XSS in the Video Downloader component before 1.5 of Avast Secure Browser 77.1.1831.91 and AVG Secure Browser 77.0.1790.77 allows websites to execute their code in the context of this component. While Video Downloader is technically a browser extension, it is granted a very wide set of privileges and can for example access cookies and browsing history, spy on the user while they are surfing the web, and alter their surfing experience in almost arbitrary ways. Una vulnerabilidad de tipo XSS en el componente Video Downloader versiones anteriores a la versión 1.5 del Avast Secure Browser versión 77.1.1831.91 y AVG Secure Browser versión 77.0.1790.77, permite a los sitios web ejecutar su código en el contexto de este componente. Aunque Video Downloader es técnicamente una extensión del navegador, se le otorga un rango muy amplio de privilegios y puede, por ejemplo, acceder a cookies y al historial de navegación, espiar al usuario mientras navega en la web y alterar su experiencia de navegación en modos casi arbitrarios. • https://palant.de/2020/01/13/pwning-avast-secure-browser-for-fun-and-profit • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •
CVSS: 6.1EPSS: 0%CPEs: 4EXPL: 1CVE-2019-18653
https://notcve.org/view.php?id=CVE-2019-18653
A Cross Site Scripting (XSS) issue exists in Avast AntiVirus (Free, Internet Security, and Premiere Edition) 19.3.2369 build 19.3.4241.440 in the Network Notification Popup, allowing an attacker to execute JavaScript code via an SSID Name. Se presenta un problema de tipo Cross Site Scripting (XSS) en Avast AntiVirus (Free, Internet Security y Premiere Edition) versión 19.3.2369 build 19.3.4241.440, en la ventana emergente de notificación de red, permitiendo a un atacante ejecutar código JavaScript por medio de un nombre SSID. • http://firstsight.me/2019/10/5000-usd-xss-issue-at-avast-desktop-antivirus-for-windows-yes-desktop https://medium.com/%40YoKoKho/5-000-usd-xss-issue-at-avast-desktop-antivirus-for-windows-yes-desktop-1e99375f0968 • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •
CVSS: 7.8EPSS: 0%CPEs: 2EXPL: 1CVE-2019-17093
https://notcve.org/view.php?id=CVE-2019-17093
An issue was discovered in Avast antivirus before 19.8 and AVG antivirus before 19.8. A DLL Preloading vulnerability allows an attacker to implant %WINDIR%\system32\wbemcomn.dll, which is loaded into a protected-light process (PPL) and might bypass some of the self-defense mechanisms. This affects all components that use WMI, e.g., AVGSvc.exe 19.6.4546.0 and TuneupSmartScan.dll 19.1.884.0. Se detectó un problema en Avast antivirus versiones anteriores a 19.8 y AVG antivirus versiones anteriores a 19.8. Una vulnerabilidad de Precarga de DLL permite a un atacante implantar una biblioteca %WINDIR%\system32\wbemcomn.dll, que se carga en un proceso protected-light (PPL) y puede omitir algunos de los mecanismos de autodefensa. • https://safebreach.com/Post/Avast-Antivirus-AVG-Antivirus-DLL-Preloading-into-PPL-and-Potential-Abuses https://safebreach.com/blog • CWE-427: Uncontrolled Search Path Element •