A vulnerability, which was classified as problematic, was found in WAVM up to 2018-07-26. Affected is the function llvm::InstructionCombiningPass::runOnFunction of the file libRuntime.so of the component WebAssembly Virtual Machine. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

In WAVM through 2018-07-26, a crafted file sent to the WebAssembly Virtual Machine may cause a denial of service (application crash) or possibly have unspecified other impact because libRuntime.so!llvm::InstructionCombiningPass::runOnFunction is mishandled.

The bug was discovered 07/26/2018. The weakness was published 09/10/2018 (Website). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2018-16769 since 09/09/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 46 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entries are available at VDB-123781, VDB-123779, VDB-123778 and VDB-123777.

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• WAVM

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• 2018-07-26

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