Kaspersky Antivirus incorrect %PROGRAMDATA% ACL

2015.11.17

Credit: Tavis Ormandy

Risk: Medium

Local: Yes

Remote: No

CVE: N/A

CWE: N/A

The ACL on %PROGRAMDATA%Kaspersky Lab allows BUILTINUsers to create new files. This can be abused to create new plugins and modules during update, and other filesystem races to gain elevated privileges.

C:UsersTavis Ormandy>icacls "%PROGRAMDATA%Kaspersky Lab"
C:ProgramDataKaspersky Lab NT AUTHORITYSYSTEM:(I)(OI)(CI)(F)
                             BUILTINAdministrators:(I)(OI)(CI)(F)
                             CREATOR OWNER:(I)(OI)(CI)(IO)(F)
                             BUILTINUsers:(I)(OI)(CI)(RX)
                             BUILTINUsers:(I)(CI)(WD,AD,WEA,WA)

Successfully processed 1 files; Failed processing 0 files

An example attack is to find the MD5 of an upcoming update, create a DLL at Cacheqscan.kdl.{md5} that does something in DllMain. The next time Kaspersky updates, avp.exe will spawn load the file.

References:

https://code.google.com/p/google-security-research/issues/detail?id=535

See this note in RAW Version

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Kaspersky Antivirus incorrect %PROGRAMDATA% ACL

References:

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