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Vulnerability of Kaspersky AV: infinite loop via UPX

Synthesis of the vulnerability 

An attacker can create a malicious UPX file creating an infinite loop during its analyze.
Impacted products: Kaspersky AV.
Severity of this bulletin: 2/4.
Creation date: 05/03/2007.
Références of this threat: BID-22795, CVE-2007-1281, VIGILANCE-VUL-6603.

Description of the vulnerability 

Programs can be packed with UPX (Ultimate Packer for eXecutables) in order to shrink their size and make their analyze more complex.

An attacker can create an UPX file with a negative offset in order to generate an infinite loop in Kaspersky antivirus.

An attacker can therefore send a malicious compacted program in order to generate a denial of service.
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This computer weakness alert impacts software or systems such as Kaspersky AV.

Our Vigil@nce team determined that the severity of this weakness note is medium.

The trust level is of type confirmed by a trusted third party, with an origin of document.

An attacker with a expert ability can exploit this weakness bulletin.

Solutions for this threat 

Kaspersky AV: update for UPX.
Automatic update published after 7th of Febrary 2007 are corrected.
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