CVE-2018-18920

Py-EVM v0.2.0-alpha.33 allows attackers to make a vm.execute_bytecode call that triggers computation._stack.values with '"stack": [100, 100, 0]' where b'\x' was expected, resulting in an execution failure because of an invalid opcode. This is reportedly related to "smart contracts can be executed indefinitely without gas being paid."

CVSS v3 8.8 HIGH
CVSS v2.0 6.8 MEDIUM

8.8^/10

CVSS v3 : HIGH

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

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

6.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/ethereum/py-evm/issues/1448	Exploit Third Party Advisory
https://twitter.com/AlexanderFisher/status/1060923428641878019	Third Party Advisory
https://twitter.com/NettaLab/status/1060889400102383617	Third Party Advisory
https://www.reddit.com/r/ethereum/comments/9vkk2g/netta_labs_claim_to_have_found_a_vulnerability_in/e9d3wyx/	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:ethereum:py-evm:0.2.0:alpha.33:*:*:*:*:*:*

History

No history.

Information

Published : 2018-11-12 02:29

Updated : 2024-02-04 20:03

NVD link : CVE-2018-18920

Mitre link : CVE-2018-18920

CVE.ORG link : CVE-2018-18920

JSON object : View

Products Affected

ethereum

py-evm

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

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