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Moderate 65 Cryptographic libraries

crypto: improve CSPRNG backtracking resistance

Public commit record

What the developer wrote

Authored by selsta

60/100 · Adequate
crypto: improve CSPRNG backtracking resistance

Reported by xmrack and the MAGIC Monero Fund.

Co-authored-by: jeffro256 <jeffro256@tutanota.com>
✓ Descriptive subject✓ Names a concrete action or component✓ Provides an explanatory body
The short version

What changed, and why it matters

This commit strengthens Monero's built-in random number generator so that if an attacker later steals the generator's internal memory state, they cannot easily figure out what random numbers were generated in the past. It also locks that sensitive state in RAM so it cannot be swapped to disk. The change is a defensive hardening patch, not a fix for an active exploit, and the exact real-world attack it prevents is not described in the commit materials.

Recommended action

Treat as a security-hardening improvement and include in the next release. Users running nodes or wallets from source should update to a build containing this commit. No immediate emergency response is indicated because no active exploit or specific vulnerable deployment is described.

Security signals we found

01

CSPRNG state backtracking resistance improved

02

Internal RNG state locked into RAM (mlock/VirtualLock)

03

State rate region zeroized after output to limit forward leakage

04

Initialization now seeds full state and permutes before use

05

Entropy mixing order changed to absorb-then-permute

06

Reported by external party (xmrack / MAGIC Monero Fund)

Risk score

Why this scored 65/100

Our methodology →
Potential impact 20/30
Exploitability 12/25
Stealth signal 10/15
Affected reach 12/15
Confidence 7/10
Evidence quality 4/5
Human-validated context

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