libnbd: Block Size Misinterpretation Causing Client Crash
CVE-2023-5215 Published on September 28, 2023

Libnbd: crash or misbehaviour when nbd server returns an unexpected block size
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.

Vendor Advisory NVD

Vulnerability Analysis

Attack Vector:
ADJACENT_NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public.

Weakness Type

Improper Handling of Unexpected Data Type

The software does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (A-Z).


Products Associated with CVE-2023-5215

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Red Hat Enterprise Linux (RHEL)
 
Red Hat Libnbd
 
Red Hat Advanced Virtualization
 

Affected Versions

Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8 Advanced Virtualization: Red Hat Enterprise Linux 8 Advanced Virtualization:

Exploit Probability

EPSS
0.05%
Percentile
14.15%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.