#VU108111 Heap-based buffer overflow in libbpf - CVE-2021-45941

Vulnerability identifier: #VU108111

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-45941

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libbpf
Other software / Other software solutions

Vendor: libbpf

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a boundary error within the __bpf_object__open (called from bpf_object__open_mem and bpf-object-fuzzer.c). A remote attacker can create a specially crafted file, trick the victim into opening it, trigger heap-based buffer overflow and perform a denial of service attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

libbpf: 0.6.0 - 0.6.1

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External links
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=40957
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libbpf/OSV-2021-1576.yaml

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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.