Block 18 Ethereum ERC20 Token approveAndCallcode Smart Contract input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Block 18. The affected element is the function approveAndCallcode of the component Ethereum ERC20 Token Handler. The manipulation as part of Smart Contract results in input validation. This vulnerability is reported as CVE-2018-12703. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Block 18 (affected version unknown). Affected is the function approveAndCallcode of the component Ethereum ERC20 Token Handler. The manipulation as part of a Smart Contract leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The approveAndCallcode function of a smart contract implementation for Block 18 (18T), an tradable Ethereum ERC20 token, allows attackers to steal assets (e.g., transfer the contract's balances into their account) because the callcode (i.e., _spender.call(_extraData)) is not verified, aka the "evilReflex" issue. NOTE: a PeckShield disclosure states "some researchers have independently discussed the mechanism of such vulnerability."

The bug was discovered 06/23/2018. The weakness was disclosed 06/25/2018 (Website). The advisory is available at huobiglobal.zendesk.com. This vulnerability is traded as CVE-2018-12703 since 06/23/2018. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

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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Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/23/2018 🔍
06/23/2018 +0 days 🔍
06/25/2018 +1 days 🔍
06/25/2018 +0 days 🔍
06/25/2018 +0 days 🔍
02/21/2020 +606 days 🔍

Sourcesinfo

Advisory: huobiglobal.zendesk.com
Status: Not defined

CVE: CVE-2018-12703 (🔍)
GCVE (CVE): GCVE-0-2018-12703
GCVE (VulDB): GCVE-100-119862
See also: 🔍

Entryinfo

Created: 06/25/2018 21:59
Updated: 02/21/2020 17:16
Changes: 06/25/2018 21:59 (57), 02/21/2020 17:16 (1)
Complete: 🔍
Cache ID: 216::103

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