Vulnerability · Published May 12, 2021 · Assigned by GitHub_M

CVE-2021-29511Memory over-allocation in evm crate

Medium 6.5

In plain English

A medium-severity resource allocation without limits in evm from rust-blockchain. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 70% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)1.3%top 29.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

evm is a pure Rust implementation of Ethereum Virtual Machine. Prior to the patch, when executing specific EVM opcodes related to memory operations that use `evm_core::Memory::copy_large`, the `evm` crate can over-allocate memory when it is not needed, making it possible for an attacker to perform denial-of-service attack. The flaw was corrected in commit `19ade85`. Users should upgrade to `==0.21.1, ==0.23.1, ==0.24.1, ==0.25.1, >=0.26.1`. There are no workarounds. Please upgrade your `evm` crate version.

Affected products (as reported)

Vendor	Product	Versions
rust-blockchain	evm	< 0.21.1= 0.22.0= 0.23.0= 0.24.0= 0.25.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388 x_refsource_CONFIRM
https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd x_refsource_MISC
https://crates.io/crates/evm x_refsource_MISC