#VU31776 Code Injection in mbed TLS - CVE-2015-8036

Vulnerability identifier: #VU31776

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-8036

CWE-ID: CWE-94

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 execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in a long session ticket name to the session ticket extension, which is not properly handled when creating a ClientHello message to resume a session. NOTE: this identifier was SPLIT from CVE-2015-5291 per ADT3 due to different affected version ranges. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update to version 2.1.2.

Vulnerable software versions

mbed TLS: 2.0.0, 2.1.0 - 2.1.1

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2015-October/169625.html
https://lists.opensuse.org/opensuse-updates/2016-08/msg00009.html
https://www.debian.org/security/2016/dsa-3468
https://guidovranken.files.wordpress.com/2015/10/cve-2015-5291.pdf
https://guidovranken.wordpress.com/2015/10/07/cve-2015-5291/
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2015-01

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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.