#VU37733 Buffer overflow in Debian Linux - CVE-2017-17853

Vulnerability identifier: #VU37733

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-2017-17853

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 incorrect BPF_RSH signed bounds calculations.

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=4374f256ce8182019353c0c639bb8d0695b4c941
https://www.openwall.com/lists/oss-security/2017/12/21/2
https://github.com/torvalds/linux/commit/4374f256ce8182019353c0c639bb8d0695b4c941

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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.