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CVE-2023-34966— Samba: infinite loop in mdssvc rpc service for spotlight

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Samba是用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba 4.18.5之前版本存在安全漏洞，该漏洞源于未经身份验证的攻击者可以通过发出格式错误的RPC请求来触发无限循环错误。

CVSS 7.5 · High EPSS 62.40% · P99
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I. Basic Information for CVE-2023-34966

Vulnerability Information
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Vulnerability Title
Samba: infinite loop in mdssvc rpc service for spotlight
Source: CVE Program / CVE List V5
Vulnerability Description
An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba是用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba 4.18.5之前版本存在安全漏洞，该漏洞源于未经身份验证的攻击者可以通过发出格式错误的RPC请求来触发无限循环错误。
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 8 0:4.18.6-1.el8 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 8 0:4.18.6-1.el8 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.15.5-15.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.17.5-5.el8_8 ~ * cpe:/a:redhat:rhel_eus:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:4.18.6-100.el9 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9 0:4.18.6-100.el9 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:4.17.5-105.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::crb
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.15.5-15.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Storage 3 - cpe:/a:redhat:storage:3

II. Public POCs for CVE-2023-34966

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III. Intelligence Information for CVE-2023-34966

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Vendor Advisories for CVE-2023-34966 (9)

Mailing List Discussions for CVE-2023-34966 (2)

Other References for CVE-2023-34966 (1)

Same Patch Batch · Red Hat · 2023-07-20 · 5 CVEs total

CVE-2023-3347 5.9 MEDIUM Samba: smb2 packet signing is not enforced when "server signing = required" is set
CVE-2022-2127 5.9 MEDIUM Samba: out-of-bounds read in winbind auth_crap
CVE-2023-34968 5.3 MEDIUM Samba: spotlight server-side share path disclosure
CVE-2023-34967 5.3 MEDIUM Samba: type confusion in mdssvc rpc service for spotlight

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-835

V. Comments for CVE-2023-34966

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