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Re: Norton AntiVirus Denial Of Service Vulnerability [Part: !!!]
From: Tom Spencer (tommojohosting.com)
Date: Fri Jul 09 2004 - 13:53:52 CDT
The same thing happens with classic mail bombs like 42.zip, NAV can't
Bipin Gautam wrote:
> Norton AntiVirus Denial Of Service Vulnerability [Part: !!!]
> *vulnerable [...only tested on!]
> Symantec Norton AntiVirus 2003 Professional Edition
> Symantec Norton AntiVirus 2002
> *not vulnerable
> Mcafee 7*
> Mcafee 8*
> Risk Impact: Medium
> Remote: yes
> While having a virus scan [automatic/manual] of some specially crafted compressed files; NAV triggers a DoS using 100% CPU for a very long time. Morover, NAV is unable to stop the scan in middle, even if the user wishes to manually stop the virus scan. Then, in this situation the only alternate is to kill the process.
> --- [Proof of Concept] ---
> Please download this file.
> http://www.geocities.com/visitbipin/av_bomb_3.zip <--- For symantec.
> http://www.geocities.com/visitbipin/EXTRACTit1st.zip <--- A bzip2 file, test it on other AV products, too.
> The file contains, 'EICAR Test String' burried in 49647 directories. This is just a RAW 'proof of concept'. A few 100kb's of compressed file could be crafted in a way... NAV will take hours or MIGHT even days to complete the scan causing 100% cup use in email gateways for hours. The compressed archive must not necessarily be a '.zip' to trigger this attack.
> PLEASE: ...test this issue with other AV / trojan scanners as they might also be vulnerable.
> Bipin Gautam
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