CVE-2025-65849: Altcha Package Suffers from Proof-of-Work Obfuscation Mode Cryptanalytic Break
Summary
CVE-2025-65849: Altcha Proof-of-Work obfuscation mode cryptanalytic break. Affects altcha versions < 0.8.0. No fix is published. How to fix ↓
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Background
Altcha is an npm package designed for implementing Proof-of-Work mechanisms in various applications. It provides developers with tools to create secure and efficient mining processes. However, versions 0.8.0 and later have been found to be vulnerable to a cryptanalytic attack that compromises the integrity of its obfuscation mode, allowing unauthorized access to sensitive nonce values.
Vulnerability Detail
The vulnerability arises from a cryptanalytic break in the Altcha Proof-of-Work obfuscation mode, which was introduced in version 0.8.0. This flaw allows remote attackers to recover the Proof-of-Work nonce in constant time through mathematical deduction, potentially undermining the security of applications relying on this mechanism. The implications of this vulnerability include unauthorized access to mining processes and the potential for exploitation in various applications that utilize the Altcha package.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, consider disabling the Proof-of-Work obfuscation mode in your application until you can update to a patched version. This can be done by modifying your configuration settings to bypass the obfuscation feature.
Conclusion
The Altcha package has a significant vulnerability in its Proof-of-Work obfuscation mode, allowing for potential exploitation. It is crucial for developers using this package to update to a secure version and consider workarounds to mitigate risks until an update can be applied.
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FAQ
The vulnerability allows attackers to recover the Proof-of-Work nonce in constant time, compromising the security of the obfuscation mode.
Versions 0.8.0 and later of the Altcha package are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
As a temporary measure, you can disable the Proof-of-Work obfuscation mode in your application until you are able to update.
The consequences include unauthorized access to mining processes and potential exploitation of applications that rely on the Altcha package.
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