#VU6351 Heap-based buffer overflow in Flex - CVE-2017-5469

Vulnerability identifier: #VU6351

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-5469, CVE-2016-6354

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Flex
Universal components / Libraries / Libraries used by multiple products

Vendor: Flex

Description

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

The vulnerability exists due to boundary error in yy_get_next_buffer() function in Flex before 2.6.1. A remote attacker can trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Update to version 2.1.6.

Vulnerable software versions

Flex: 2.6

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External links
https://www.openwall.com/lists/oss-security/2016/07/18/8

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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.