Bug 2326503 (CVE-2023-39176)

Summary: CVE-2023-39176 kernel: ksmbd: Transform Header Out-Of-Bounds Read Information Disclosure Vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found within the parsing of SMB2 requests that have a transform header in the kernel ksmbd module. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this to disclose sensitive information on affected installations of Linux. Only systems with ksmbd enabled are vulnerable to this CVE.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2024-11-15 16:40:44 UTC 
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability. However, only systems with ksmbd enabled are vulnerable.

The specific flaw exists within the parsing of SMB2 requests that have a transform header. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.

Reference:
https://www.zerodayinitiative.com/advisories/ZDI-24-586/
Comment 1 Mauro Matteo Cascella 2024-11-15 16:41:39 UTC 
Upstream patch:
https://lore.kernel.org/lkml/CAH2r5mv+Sy5mrZThrQUf1na-mg-B9DiLd5fkYs9sPo97GWirCA@mail.gmail.com/