Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU14438
Risk: Low
CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2018-12434
CWE-ID:
CWE-200 - Exposure of sensitive information to an unauthorized actor
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists due to information leak via memory caches when modular addition calculations may not run in constant time when private keys are used to generate Elliptic Curve Digital Signature Algorithm (ECDSA) or Digital Signature Algorithm (DSA) signatures. A local attacker can conduct memory-cache side-channel timing attacks and recover sensitive information, such as the ECDSA or DSA private keys used to generate the signatures, which could be used to conduct additional attacks.
MitigationUpdate to version 2.6.5, 2.7.4.
LibreSSL: 2.6.0 - 2.7.3
CPE2.3https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txt
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txt
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.