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CVE-2023-52440— ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 ksmbd 的 ksmbd_decode_ntlmssp_auth_blob() 函数存在溢出问题。

CVSS 9.8 · Critical EPSS 21.91% · P98

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux c5049d2d73b2dc8e6bb64be633250bad1ae3d9ef< bd554ed4fdc3d38404a1c43d428432577573e809 affected
f9929ef6a2a55f03aac61248c6a3a987b8546f2a< 30fd6521b2fbd9b767e438e31945e5ea3e3a2fba affected
f9929ef6a2a55f03aac61248c6a3a987b8546f2a< 7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4 affected
f9929ef6a2a55f03aac61248c6a3a987b8546f2a< ecd7e1c562cb08e41957fcd4b0e404de5ab38e20 affected
f9929ef6a2a55f03aac61248c6a3a987b8546f2a< 4b081ce0d830b684fdf967abc3696d1261387254 affected
5.17 affected
< 5.17 unaffected
6.1.52≤ 6.1.* unaffected
… +3 more rows
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I. Basic Information for CVE-2023-52440

Vulnerability Information
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Vulnerability Title
ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 ksmbd 的 ksmbd_decode_ntlmssp_auth_blob() 函数存在溢出问题。
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
Linux Linux c5049d2d73b2dc8e6bb64be633250bad1ae3d9ef ~ bd554ed4fdc3d38404a1c43d428432577573e809 -
Linux Linux 5.17 -

II. Public POCs for CVE-2023-52440

# POC Description Source Link Shenlong Link
1 Authenticated 0-click RCE against Linux 6.1.45 for CVE-2023-52440 and CVE-2023-4130 https://github.com/BitsByWill/ksmbd-n-day POC Details
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III. Intelligence Information for CVE-2023-52440

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Mailing List Discussions for CVE-2023-52440 (1)

Other References for CVE-2023-52440 (4)

Same Patch Batch · Linux · 2024-02-21 · 7 CVEs total

CVE-2024-26585 9.8 CRITICAL tls: fix race between tx work scheduling and socket close
CVE-2024-26583 9.8 CRITICAL tls: fix race between async notify and socket close
CVE-2024-26584 9.8 CRITICAL net: tls: handle backlogging of crypto requests
CVE-2024-26582 9.8 CRITICAL net: tls: fix use-after-free with partial reads and async decrypt
CVE-2023-52442 9.1 CRITICAL ksmbd: validate session id and tree id in compound request
CVE-2023-52441 9.1 CRITICAL ksmbd: fix out of bounds in init_smb2_rsp_hdr()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52440

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