#VU26542 Input validation error in Avast Antivirus - CVE-2020-10864

Vulnerability identifier: #VU26542

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-10864

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Avast Antivirus
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Avast Software s.r.o.

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the aswTask RPC endpoint for the TaskEx library in the Avast Service (AvastSvc.exe). A remote attacker can trigger a reboot via RPC from a Low Integrity process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Avast Antivirus: 19.8.2393

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External links
https://forum.avast.com/index.php?topic=232420.0
https://forum.avast.com/index.php?topic=232423.0
https://github.com/umarfarook882/Avast_Multiple_Vulnerability_Disclosure/blob/master/README.md

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.