PT-2018-15365 · Ethereum · Go-Ethereum

Lcatroo · Published 2018-12-24 · Updated 2019-10-03 · CVE-2018-20421

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Go Ethereum (aka geth) version 1.8.19

Description The issue allows attackers to cause a denial of service due to memory consumption. This can be achieved by rewriting the length of a dynamic array in memory and then writing data to a single memory location with a large index number. An example of this exploit involves using assembly { mstore } followed by a c[0xC800000] = 0xFF assignment.

Recommendations For Go Ethereum (aka geth) version 1.8.19, update to a newer version that contains a fix for this issue to prevent denial of service attacks.

Exploit

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2018-20421

Affected Products

Go-Ethereum

References · 3

• 🔥 https://github.com/ethereum/go-ethereum/issues/18289 · Exploit
• https://osv.dev/vulnerability/CVE-2018-20421 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-20421 · Security Note