#VU33341 Buffer overflow in Chicken Scheme - CVE-2017-6949

Vulnerability identifier: #VU33341

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-6949

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Chicken Scheme
Universal components / Libraries / Software for developers

Vendor: call-cc.org

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An issue was discovered in CHICKEN Scheme through 4.12.0. When using a nonstandard CHICKEN-specific extension to allocate an SRFI-4 vector in unmanaged memory, the vector size would be used in unsanitised form as an argument to malloc(). With an unexpected size, the impact may have been a segfault or buffer overflow.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Chicken Scheme: 4.0.0 - 4.12.0

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External links
https://lists.gnu.org/archive/html/chicken-announce/2017-03/msg00000.html
https://www.securityfocus.com/bid/97317

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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.