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CRITICAL severity

PHPECC vulnerable to multiple cryptographic side-channel attacksGHSA-346h-749j-r28w

CRITICAL

GHSA-346h-749j-r28w is a critical-severity (CVSS 9.1) vulnerability in mdanter/ecc. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Published
Updated
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of Nov 28, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐘mdanter/ecc

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

ECDSA Canonicalization

PHPECC is vulnerable to malleable ECDSA signature attacks.

Constant-Time Signer

When generating a new ECDSA signature, the GMPMath adapter was used. This class wraps the GNU Multiple Precision arithmetic library (GMP), which does not aim to provide constant-time implementations of algorithms.

An attacker capable of triggering many signatures and studying the time it takes to perform each operation would be able to leak the secret number, k, and thereby learn the private key.

EcDH Timing Leaks

When calculating a shared secret using the EcDH class, the scalar-point multiplication is based on the arithmetic defined by the Point class.

Even though the library implements a Montgomery ladder, the add(), mul(), and getDouble() methods on the Point class are not constant-time. This means that your ECDH private keys are leaking information about each bit of your private key through a timing side-channel.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagistmdanter/eccall versionsNo fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mdanter/ecc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of mdanter/ecc for GHSA-346h-749j-r28w. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### ECDSA Canonicalization PHPECC is vulnerable to malleable ECDSA signature attacks. ### Constant-Time Signer When generating a new ECDSA signature, the GMPMath adapter was used. This class wraps the GNU Multiple Precision arithmetic library (GMP), which does not aim to provide constant-time implementations of algorithms. An attacker capable of triggering many signatures and studying the time it takes to perform each operation would be able to leak the secret number, `k`, and thereby learn the private key. ### EcDH Timing Leaks When calculating a shared secret using the `EcDH` class, t
O3 Security · Impact-Aware SCA

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PHPECC vulnerable to multiple cryptographic…