Vulnerability identifier: #VU14173

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0498

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mbed TLS
Universal components / Libraries / Libraries used by multiple products

Vendor: ARM

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists in ARM mbed TLS  due to insufficient security restrictions imposed by the affected software when a cipher suite based on cipher block chaining (CBC) is used. A remote attacker who is able to observe and manipulate network packets can conduct a timing-based side-channel attack and partially recover the plaintext content.

Mitigation
Update to version 2.12.0, 2.7.5 or 2.1.14.

Vulnerable software versions

mbed TLS: 2.8.0, 2.7.0 - 2.7.2, 2.1.0 - 2.1.11, 1.3.0 - 1.3.22, 2.4.0 - 2.4.2

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External links
http://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2018-02

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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