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Multi-process concurrency is effective in improving program efficiency andmaximizing CPU utilization. The correct execution of concurrency is ensured bythe mutual exclusion and synchronization mechanism (MESM) that manages theshared hardware and software resources. We propose MES-Attacks, a new set ofsoftware-controlled covert channel attacks based on MESM to transmitconfidential information. MES-Attacks offer several advantages: 1) the covertchannels are constructed at software level and can be deployed on any hardware;2) closed share of resource ensures the quality of the channels with lowinterference and makes them hard to be detected; and 3) it utilizes thesystem's software resources which are abound and hence difficult to isolate. Webuilt covert channels using different MESMs on Windows and Linux, includingEvent, Timer, FileLockEX, Mutex, Semaphore and flock. Experimental resultsdemonstrate that these covert channels can achieve transmission rate of 13.105kb/s, 12.383 kb/s, and 6.552 kb/s, respectively in the scenarios of local,cross-sandbox and cross-VM, where the bit error rates are all under 1\%.

MES-Attacks: Software-Controlled Covert Channels based on Mutual Exclusion and Synchronization