Information disclosure vulnerabilities in ARM mbed TLS

Published: 2018-08-02

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-0498 CVE-2018-0497
CWE-ID	CWE-200
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	mbed TLS Universal components / Libraries / Libraries used by multiple products
Vendor	ARM

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU14173

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-2018-0498

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

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: 1.3.0 - 2.8.0

CPE2.3

External links

https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2018-02

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.

2) Information disclosure

EUVDB-ID: #VU14174