Safety vulnerability ID: 64458
The information on this page was manually curated by our Cybersecurity Intelligence Team.
Vyper, in versions <=0.3.10, has a memory buffer overflow issue. The concat function could overwrite valid data due to incorrect adherence to the copy_bytes function's API in builds >=0.3.2. This overflow, dependent on the length, could alter contract semantics, potentially unnoticed during testing. Not all concat uses were affected, as it required specific conditions like being in an internal function near a return statement without other memory allocations. Though no vulnerable contracts in production were found, the issue is fixed in commit 55e18f6d1.
https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p
Latest version: 0.3.10
Vyper: the Pythonic Programming Language for the EVM
Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. The `concat` built-in can write over the bounds of the memory buffer that was allocated for it and thus overwrite existing valid data. The root cause is that the `build_IR` for `concat` doesn't properly adhere to the API of copy functions (for `>=0.3.2` the `copy_bytes` function). A contract search was performed and no vulnerable contracts were found in production. The buffer overflow can result in the change of semantics of the contract. The overflow is length-dependent and thus it might go unnoticed during contract testing. However, certainly not all usages of concat will result in overwritten valid data as we require it to be in an internal function and close to the return statement where other memory allocations don't occur. This issue has been addressed in commit `55e18f6d1` which will be included in future releases. Users are advised to update when possible. See CVE-2024-22419.
MISC:https://github.com/vyperlang/vyper/commit/55e18f6d128b2da8986adbbcccf1cd59a4b9ad6f: https://github.com/vyperlang/vyper/commit/55e18f6d128b2da8986adbbcccf1cd59a4b9ad6f
MISC:https://github.com/vyperlang/vyper/issues/3737: https://github.com/vyperlang/vyper/issues/3737
MISC:https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p: https://github.com/vyperlang/vyper/security/advisories/GHSA-2q8v-3gqq-4f8p
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