#VU37736 Buffer overflow in Debian Linux - CVE-2017-17856

Vulnerability identifier: #VU37736

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-17856

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Debian Linux
Operating systems & Components / Operating system

Vendor: Debian

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

kernel/bpf/verifier.c in the Linux kernel through 4.14.8 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging the lack of stack-pointer alignment enforcement.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 9.0

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External links
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a5ec6ae161d72f01411169a938fa5f8baea16e8f
https://www.openwall.com/lists/oss-security/2017/12/21/2
https://github.com/torvalds/linux/commit/a5ec6ae161d72f01411169a938fa5f8baea16e8f

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.