Denial of service in ARM mbed TLS

1) Buffer overflow

EUVDB-ID: #VU10955

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-0487

CWE-ID: CWE-120 - Buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to execute arbitrary code on the target system.

The weakness exists due to improper validation of Rivest-Shamir-Adleman Probabilistic Signature Scheme (RSASSA-PSS) signatures. A remote attacker can send a specially crafted certificate chain, which the affected software can mishandle during RSASSA-PSS signature verification, trigger buffer overflow and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update to versions 1.3.22, 2.1.10 or 2.7.0.

Vulnerable software versions

mbed TLS: 1.3.8 - 2.4.2

CPE2.3

• cpe:2.3:a:arm:mbed_tls:1.3.21:*:*:*:*:*:*:*
• cpe:2.3:a:arm:mbed_tls:2.1.9:*:*:*:*:*:*:*
• cpe:2.3:a:arm:mbed_tls:2.4.2:*:*:*:*:*:*:*

External links

https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2018-01

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.