Vyper control flow

Summaryinfo

A vulnerability was found in Vyper and classified as problematic. This affects an unknown function. Executing a manipulation can lead to control flow. The identification of this vulnerability is CVE-2023-40015. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Vyper (the affected version is unknown) and classified as problematic. This vulnerability affects an unknown code. The manipulation with an unknown input leads to a control flow vulnerability. The CWE definition for the vulnerability is CWE-670. The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated. As an impact it is known to affect integrity. CVE summarizes:

Vyper is a Pythonic Smart Contract Language. For the following (probably non-exhaustive) list of expressions, the compiler evaluates the arguments from right to left instead of left to right. `unsafe_add, unsafe_sub, unsafe_mul, unsafe_div, pow_mod256, |, &, ^ (bitwise operators), bitwise_or (deprecated), bitwise_and (deprecated), bitwise_xor (deprecated), raw_call, , =, ==, !=, in, not in (when lhs and rhs are enums)`. This behaviour becomes a problem when the evaluation of one of the arguments produces side effects that other arguments depend on. The following expressions can produce side-effect: state modifying external call , state modifying internal call, `raw_call`, `pop()` when used on a Dynamic Array stored in the storage, `create_minimal_proxy_to`, `create_copy_of`, `create_from_blueprint`. This issue has not yet been patched. Users are advised to make sure that the arguments of the expression do not produce side effects or, if one does, that no other argument is dependent on those side effects.

The weakness was shared 09/05/2023 as GHSA-g2xh-c426-v8mf. The advisory is available at github.com. This vulnerability was named CVE-2023-40015 since 08/08/2023. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/30/2023).

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

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• Vyper

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• 🔍

CPE 2.2info

• 🔍

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