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Flash Broker-Based Sandbox Escape Via Unexpected Directory Lock

Flash Broker-Based Sandbox Escape Via Unexpected Directory Lock
Posted Aug 19, 2015
Authored by Jietao Yang, Jihui Lu

FlashBroker is vulnerable to NTFS junction attack to write an arbitrary file to the filesystem under user permissions. There is a bad check in FlashBroker BrokerCreateFile method and BrokerMoveFileEx method. FlashBroker uses CreateFile to open the destination folder for check. If CreateFile fails, the destination will be considered as a valid path. However, FlashBroker uses dwShareMode as 0 in CreateFile, which make CreateFile always fail if handle of the destination folder is held by other.

tags | exploit, arbitrary
systems | linux
advisories | CVE-2015-3083
SHA-256 | 1833e423f195e8f2809219e0689a0b518a6badd8204abdb35e1d3ceaabc57452
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