Vulnerability identifier: #VU82550

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5215

CWE-ID: CWE-252

Exploitation vector: Network

Exploit availability: No

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

Vendor: libguestfs

Description

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

The vulnerability exists due to improper input validation when handling server responses in NBD client. A remote server can return a block size larger than 2^63 and crash the client.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libnbd: 1.0.0 - 1.17.5

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External links
http://access.redhat.com/security/cve/CVE-2023-5215
http://bugzilla.redhat.com/show_bug.cgi?id=2241041
http://listman.redhat.com/archives/libguestfs/2023-September/032635.html

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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.