Advisories

Avira Internet Security Arbitrary File Deletion via Improper Link Resolution

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severity
high
date
Affecting
  • Avira Internet Security <= 1.1.109.1990, confirmed to be fixed in 1.1.114.3113

CWE
  • CWE-59 Improper Link Resolution Before File Access ('Link Following')
CVSS
8.5
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Quarkslab
Description
Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration.

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