Bug 2219806 (CVE-2023-32257, ZDI-23-705, ZDI-CAN-20596) - CVE-2023-32257 kernel: ksmbd: session race condition remote code execution vulnerability
Summary: CVE-2023-32257 kernel: ksmbd: session race condition remote code execution vu...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2023-32257, ZDI-23-705, ZDI-CAN-20596
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 2190273
TreeView+ depends on / blocked
 
Reported: 2023-07-05 12:36 UTC by Mauro Matteo Cascella
Modified: 2023-07-05 13:39 UTC (History)
42 users (show)

Fixed In Version: kernel 6.4-rc1
Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.
Clone Of:
Environment:
Last Closed: 2023-07-05 12:36:46 UTC
Embargoed:

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Description Mauro Matteo Cascella 2023-07-05 12:36:25 UTC 
An improper locking issue leading to a race condition vulnerability was found in ksmbd, a high-performance in-kernel SMB server. Quoting ZDI security advisory [1]:

"This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.

The specific flaw exists within the processing of SMB2_SESSION_SETUP and SMB2_LOGOFF commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel."

[1] https://www.zerodayinitiative.com/advisories/ZDI-CAN-20596/
Comment 1 Mauro Matteo Cascella 2023-07-05 12:36:46 UTC 
Upstream fix:
https://github.com/torvalds/linux/commit/f5c779b7ddbda30866cf2a27c63e34158f858c73
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