Denial of service in ARM mbed TLS

Published: 2018-05-14

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-9988 CVE-2018-9989
CWE-ID	CWE-126
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	mbed TLS Universal components / Libraries / Libraries used by multiple products
Vendor	ARM

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Buffer over-read

EUVDB-ID: #VU12596

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-9988

CWE-ID: CWE-126 - Buffer over-read

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in ssl_parse_server_key_exchange() due to buffer over-read. A remote attacker can trigger memory corruption and cause the service to crash.

Mitigation

Update to versions 2.1.11, 2.7.2 or 2.8.0.

Vulnerable software versions

mbed TLS: 2.1.0 - 2.7.0

External links

http://tls.mbed.org/tech-updates/releases/mbedtls-2.8.0-2.7.2-and-2.1.11-released

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) Buffer over-read

EUVDB-ID: #VU12597