Description
MicroWorld eScan AV's update mechanism failed to ensure authenticity and integrity of updates: update packages were delivered and accepted without robust cryptographic verification. As a result, an on-path attacker could perform a man-in-the-middle (MitM) attack and substitute malicious update payloads for legitimate ones. The eScan AV client accepted these substituted packages and executed or loaded their components (including sideloaded DLLs and Java/installer payloads), enabling remote code execution on affected systems. MicroWorld eScan confirmed remediation of the update mechanism on 2023-07-31 but versioning details are unavailable. NOTE: MicroWorld eScan disputes the characterization in third-party reports, stating the issue relates to 2018–2019 and that controls were implemented then.
Problem types
CWE-295 Improper Certificate Validation
CWE-347 Improper Verification of Cryptographic Signature
Product status
*
Credits
Avast Threat Research
References
blog.avast.com/leading-the-charge-against-guptiminer
www.gendigital.com/...stributing-backdoors-and-casual-mining
securityaffairs.com/...news/escan-antivirus-mitm-attack.html
arstechnica.com/...service-that-delivered-updates-over-http/
www.bleepingcomputer.com/...ates-to-drop-guptiminer-malware/
thehackernews.com/...4/escan-antivirus-update-mechanism.html
www.escanav.com/en/about-us/eScan-update-advisory.asp
www.vulncheck.com/...nism-allows-mitm-replacement-of-updates
