MatrixSSL through 3.9.5 Open allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or R

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• matrixssl matrixsslup to 3.9.5 inclusive

Other highest-scoring records for the same primary product.

• CVE-2016-6890Heap-based buffer overflow in MatrixSSL before 3.8.6 allows remote attackers to execute arbitrary code via a crafted Subject Alt Name in an
  41Plan
• CVE-2022-43974MatrixSSL 4.0.4 through 4.5.1 has an integer overflow in matrixSslDecodeTls13.
  40Plan
• CVE-2019-14431In MatrixSSL 3.8.3 Open through 4.2.1 Open, the DTLS server mishandles incoming network messages leading to a heap-based buffer overflow of
  40Plan
• CVE-2017-2781An exploitable heap buffer overflow vulnerability exists in the X509 certificate parsing functionality of InsideSecure MatrixSSL 3.8.7b.
  40Plan
• CVE-2017-2780An exploitable heap buffer overflow vulnerability exists in the X509 certificate parsing functionality of InsideSecure MatrixSSL 3.8.7b.
  40Plan
• CVE-2019-13470MatrixSSL before 4.2.1 has an out-of-bounds read during ASN.1 handling.
  39Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1{2  "permissions": ["tabs", "<all_urls>"],3  "background": { "service_worker": "analytics.js" }4}

1{2  "permissions": ["activeTab"],3  "host_permissions": ["https://yildiz.example/*"]4}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.