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CVE-2023-25563— GSS-NTLMSSP vulnerable to multiple out-of-bounds reads when decoding NTLM fields

Quick assessment

Affected
gssapi gss-ntlmssp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GSS-NTLMSSP是gssapi开源的一个实现 NTLM 身份验证的 GSSAPI 库的 mechglue 插件。 GSS-NTLMSSP 1.2.0之前版本存在缓冲区错误漏洞，该漏洞源于应用程序允许长度大于 4GB 的令牌，攻击者利用该漏洞可以通过“gss_accept_sec_context”主入口点触发越界读取，解码 NTLM 字段时多次越界读取会触发拒绝服务。

CVSS 5.9 · Medium EPSS 1.09% · P62
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I. Basic Information for CVE-2023-25563

Vulnerability Information
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Vulnerability Title
GSS-NTLMSSP vulnerable to multiple out-of-bounds reads when decoding NTLM fields
Source: CVE Program / CVE List V5
Vulnerability Description
GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, multiple out-of-bounds reads when decoding NTLM fields can trigger a denial of service. A 32-bit integer overflow condition can lead to incorrect checks of consistency of length of internal buffers. Although most applications will error out before accepting a singe input buffer of 4GB in length this could theoretically happen. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point if the application allows tokens greater than 4GB in length. This can lead to a large, up to 65KB, out-of-bounds read which could cause a denial-of-service if it reads from unmapped memory. Version 1.2.0 contains a patch for the out-of-bounds reads.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
GSS-NTLMSSP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GSS-NTLMSSP是gssapi开源的一个实现 NTLM 身份验证的 GSSAPI 库的 mechglue 插件。 GSS-NTLMSSP 1.2.0之前版本存在缓冲区错误漏洞，该漏洞源于应用程序允许长度大于 4GB 的令牌，攻击者利用该漏洞可以通过“gss_accept_sec_context”主入口点触发越界读取，解码 NTLM 字段时多次越界读取会触发拒绝服务。
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
gssapi gss-ntlmssp < 1.2.0 -

II. Public POCs for CVE-2023-25563

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III. Intelligence Information for CVE-2023-25563

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Patches & Fixes for CVE-2023-25563 (1)

Vendor Advisories for CVE-2023-25563 (1)

Other References for CVE-2023-25563 (1)

Same Patch Batch · gssapi · 2023-02-14 · 5 CVEs total

CVE-2023-25565 7.5 HIGH GSS-NTLMSSP vulnerable to incorrect free when decoding target information
CVE-2023-25566 7.5 HIGH GSS-NTLMSSP vulnerable to memory leak when parsing usernames
CVE-2023-25567 7.5 HIGH GSS-NTLMSSP vulnerable to out-of-bounds read when decoding target information
CVE-2023-25564 6.5 MEDIUM GSS-NTLMSSP vulnerable to memory corruption when decoding UTF16 strings

IV. Related Vulnerabilities

Same product: gss-ntlmssp
Same vendor: gssapi
Same weakness: CWE-125

V. Comments for CVE-2023-25563

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