Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability.
Multiple AV Vendor Incorrect CRC32 Bypass Vulnerability.
Affected Product:
AntiVir 6.30.0.5
AVG 718
Sybari (Antigen for M$ exchange) 7.5.1314
Symantec 8.0
McAfee 4442
BitDefender 7.0
POC: http://www.geocities.com/visitbipin/happy-crc.zip
Description:
if you create a zip archive with invalid CRC checksum...... some AV skip the
archive marking it as clean........ by this way, you can bypass antivirus
gateways and slip in any attachment without scanning the archive. Moreover,
these days.... software tools automatically repair a *broken* archive.
Useful Reference on zip header: http://www.pkware.com/company/standards/appnote/
regards,
Bipin Gautam
http://www.geocities.com/visitbipin/
Disclaimer: The information in the advisory is believed to be accurate at the
time of printing based on currently available information. Use of the
information constitutes acceptance for use in an AS IS condition. There are no
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