PHPECC vulnerable to multiple cryptographic side-channel attacks
The advisory, in context
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
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
Earlier releases through 1.0.0 (inclusive)
No fix recorded for this interval.
16 explicitly affected versions
0.2.0, v0.3.0, v0.3.1, v0.3.2, v0.4.0, v0.4.1, v0.4.2, v0.4.3, v0.4.4, v0.4.5, v0.4.6, v0.4.7, v0.5.0, v0.5.1, v0.5.2, v1.0.0
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.0.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.2.0",
"v0.3.0",
"v0.3.1",
"v0.3.2",
"v0.4.0",
"v0.4.1",
"v0.4.2",
"v0.4.3",
"v0.4.4",
"v0.4.5",
"v0.4.6",
"v0.4.7",
"v0.5.0",
"v0.5.1",
"v0.5.2",
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}