Vulnerability identifier: #VU13400

Vulnerability risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2018-12439

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
MatrixSSL
Server applications / Server solutions for antivurus protection

Vendor: InsideSecure

Description
The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists in the MatrixSSL library due to a leakage of information through memory caches when the library uses a private key to create Elliptic Curve Digital Signature Algorithm (ECDSA) signatures as demonstrayed in the dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp source code files. A local attacker can conduct a memory-cache side-channel attack and recover sensitive information, such ECDSA private keys, which could be used to conduct further attacks.

Mitigation
Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

Vulnerable software versions

MatrixSSL: 1.8.1 - 3.9.5

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External links
http://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.