Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component. The Avira.SystemSpeedup.RealTimeOptimizer.exe process, which runs with SYSTEM privileges, deserializes data from a file located in C:\\ProgramData using .NET BinaryFormatter without implementing input validation or deserialization safeguards. Because the file can be created or modified by a local user in default configurations, an attacker can supply a crafted serialized payload that is deserialized by the privileged process, resulting in arbitrary code execution as SYSTEM.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way…
disclosure@vulncheck.com
https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions
disclosure@vulncheck.com
https://www.avira.com/en/internet-security
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/avira-internet-security-system-speedup-ins…
disclosure@vulncheck.com