#VU14174 Information disclosure in mbed TLS - CVE-2018-0497

Vulnerability identifier: #VU14174

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-0497

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 incomplete fix for CVE-2013-0169 and improper calculation of the secure hash algorithm-384 (SHA-384) when using a cipher suite based on cipher block chaining (CBC). 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: 1.3.0 - 1.3.22, 2.1.0 - 2.1.11, 2.4.0 - 2.4.2, 2.7.0 - 2.7.2, 2.8.0

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External links
https://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.