Deserialization Vulnerability in Parso: Arbitrary Code Execution via Cache Grammar Parsing

CVE-2019-12760 · MEDIUM Severity

AV:N/AC:M/AU:S/C:P/I:P/A:P

A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution. NOTE: This is disputed because "the cache directory is not under control of the attacker in any common configuration.

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