Denial of Service (DoS) The advisory has been revoked - it doesn't affect any version of package py-evm Open this link in a new tab
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Test your applications- Snyk ID SNYK-PYTHON-PYEVM-1656705
- published 21 Sep 2021
- disclosed 21 Nov 2018
- credit Unknown
Introduced: 21 Nov 2018
CVE-2018-18920 Open this link in a new tabAmendment
This was deemed not a vulnerability.
Overview
py-evm is an A Python implementation of the Ethereum Virtual Machine.
Affected versions of this package are vulnerable to Denial of Service (DoS). It 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."
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
ws
package