Unbounded Instruction Size Vulnerability in QEMU's disas_insn Function

CVE-2017-8284 · MEDIUM Severity

AV:L/AC:M/AU:N/C:C/I:C/A:C

The disas_insn function in target/i386/translate.c in QEMU before 2.9.0, when TCG mode without hardware acceleration is used, does not limit the instruction size, which allows local users to gain privileges by creating a modified basic block that injects code into a setuid program, as demonstrated by procmail. NOTE: the vendor has stated "this bug does not violate any security guarantees QEMU makes.

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