Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2020-26241— Shallow copy bug in geth

Quick assessment

Affected
ethereum go-ethereum
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ethereum Go-ethereum是Ethereum社区的一个用Go语言实现以太坊协议的代码库。 Ethereum Go-ethereum 1.9.18 之前版本存在安全漏洞，攻击者可利用该漏洞可以部署一个契约，将X写入EVM内存区域R，然后调用0x00..将R作为参数，然后将R重写为Y，最后调用RETURNDATACOPY操作码。

CVSS 6.5 · Medium EPSS 1.09% · P63

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2020-26241

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Shallow copy bug in geth
Source: CVE Program / CVE List V5
Vulnerability Description
Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth before version 1.9.17 which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth's pre-compiled dataCopy (at 0x00...04) contract did a shallow copy on invocation. An attacker could deploy a contract that writes X to an EVM memory region R, then calls 0x00..04 with R as an argument, then overwrites R to Y, and finally invokes the RETURNDATACOPY opcode. When this contract is invoked, a consensus-compliant node would push X on the EVM stack, whereas Geth would push Y. This is fixed in version 1.9.17.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Ethereum Go-ethereum 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ethereum Go-ethereum是Ethereum社区的一个用Go语言实现以太坊协议的代码库。 Ethereum Go-ethereum 1.9.18 之前版本存在安全漏洞，攻击者可利用该漏洞可以部署一个契约，将X写入EVM内存区域R，然后调用0x00..将R作为参数，然后将R重写为Y，最后调用RETURNDATACOPY操作码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ethereum go-ethereum >= 1.9.7, < 1.9.17 -

II. Public POCs for CVE-2020-26241

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2020-26241

请登录查看更多情报信息。

Vendor Advisories for CVE-2020-26241 (1)

Security Blog Posts for CVE-2020-26241 (1)

Same Patch Batch · ethereum · 2020-11-25 · 3 CVEs total

CVE-2020-26242 6.5 MEDIUM Denial of service in geth
CVE-2020-26240 5.3 MEDIUM Erroneous Proof of Work calculation in geth

IV. Related Vulnerabilities

Same product: go-ethereum
Same vendor: ethereum
Same weakness: CWE-682

V. Comments for CVE-2020-26241

No comments yet

Leave a comment