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CVE-2023-5215— Libnbd: crash or misbehaviour when nbd server returns an unexpected block size

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libnbd是一款用于编辑NBD（Network Block Device）客户端的库。 libnbd存在安全漏洞，该漏洞源于无法正确处理nbd_get_size()函数的返回值，可能会导致客户端出现应用程序崩溃或其他意外行为。

CVSS 5.3 · Medium EPSS 0.81% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-5215

Vulnerability Information
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Vulnerability Title
Libnbd: crash or misbehaviour when nbd server returns an unexpected block size
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
非预期数据类型处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
libnbd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libnbd是一款用于编辑NBD（Network Block Device）客户端的库。 libnbd存在安全漏洞，该漏洞源于无法正确处理nbd_get_size()函数的返回值，可能会导致客户端出现应用程序崩溃或其他意外行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 9 0:1.18.1-3.el9 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization - cpe:/a:redhat:advanced_virtualization:8::el8
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization - cpe:/a:redhat:advanced_virtualization:8::el8

II. Public POCs for CVE-2023-5215

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III. Intelligence Information for CVE-2023-5215

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Vendor Advisories for CVE-2023-5215 (3)

Other References for CVE-2023-5215 (1)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 9
Same vendor: Red Hat
Same weakness: CWE-241

V. Comments for CVE-2023-5215

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