CVE-2008-5521

Avira AntiVir 7.9.0.36 and possibly 7.8.1.28, when Internet Explorer 6 or 7 is used, allows remote attackers to bypass detection of malware in an HTML document…

published December 12, 2008

CVSS
—
EPSS
2%
Percentile
79.6
In the wild
Unconfirmed
What it is

⚠️ A crafty attacker could slip malware past Avira AntiVir without breaking a sweat! By disguising it in an HTML document with a sneaky MZ header, they can bypass detection like a magician performing a vanishing act. 🎩✨ Think of this vulnerability like a clever delivery driver who disguises a package as a harmless envelope. If the postal service doesn’t check for size or weight, the dangerous contents could reach your doorstep unnoticed! This means an attacker can potentially deliver malicious payloads without triggering any alarms, leaving your system exposed to harmful exploits. The implications could include unauthorized access, data theft, or further propagation of malware within your network—absolutely devastating!

Put simply

Think of this vulnerability like a clever delivery driver who disguises a package as a harmless envelope. If the postal service doesn’t check for size or weight, the dangerous contents could reach your doorstep unnoticed! This vulnerability allows remote attackers to bypass Avira AntiVir detection by inserting a malicious MZ header into an HTML document. When the filename is modified to exclude an extension, or use .txt or .jpg, the malware is virtually camouflaged from scanning efforts.

What to do

This means an attacker can potentially deliver malicious payloads without triggering any alarms, leaving your system exposed to harmful exploits. The implications could include unauthorized access, data theft, or further propagation of malware within your network—absolutely devastating! To mitigate this issue, upgrade your Avira AntiVir to the latest version available, ensuring comprehensive malware detection. Regularly audit and update your security tools to keep pace with evolving threats. Additionally, consider implementing email filtering and user training on suspicious file types to bolster defenses! You've got this! Stay proactive, and with these steps, you'll keep your systems secure and malware-free! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01905 · 79.6th percentile
Published
2008-12-12T18:13Z
EPSS history
Timeline
  • 12 DEC 18:13Z
    Avira AntiVir 7.9.0.36 and possibly 7.8.1.28, when Internet Explorer 6 or 7 is used, allows remote attackers to bypass detection of malware in an HTML document…
    cvelistv5