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CVE-2023-25564— GSS-NTLMSSP vulnerable to memory corruption when decoding UTF16 strings

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，该漏洞源于如果 ntlm_str_convert() 失败，可能导致将零写入内存中的任意位置，这将使 outlen 未初始化，如果写入命中未映射的内存或随机损坏应用程序内存空间中的一个字节，这可能会导致拒绝服务，攻击者可以通过“gss_accept_sec_context”主入口点触发该漏洞。

CVSS 6.5 · Medium EPSS 1.94% · P80
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I. Basic Information for CVE-2023-25564

Vulnerability Information
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Vulnerability Title
GSS-NTLMSSP vulnerable to memory corruption when decoding UTF16 strings
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, memory corruption can be triggered when decoding UTF16 strings. The variable `outlen` was not initialized and could cause writing a zero to an arbitrary place in memory if `ntlm_str_convert()` were to fail, which would leave `outlen` uninitialized. This can lead to a denial of service if the write hits unmapped memory or randomly corrupts a byte in the application memory space. This vulnerability can trigger an out-of-bounds write, leading to memory corruption. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point. This issue is fixed in version 1.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
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，该漏洞源于如果 ntlm_str_convert() 失败，可能导致将零写入内存中的任意位置，这将使 outlen 未初始化，如果写入命中未映射的内存或随机损坏应用程序内存空间中的一个字节，这可能会导致拒绝服务，攻击者可以通过“gss_accept_sec_context”主入口点触发该漏洞。
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-2023-25564

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III. Intelligence Information for CVE-2023-25564

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Patches & Fixes for CVE-2023-25564 (1)

Vendor Advisories for CVE-2023-25564 (1)

Other References for CVE-2023-25564 (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-2023-25563 5.9 MEDIUM GSS-NTLMSSP vulnerable to multiple out-of-bounds reads when decoding NTLM fields

IV. Related Vulnerabilities

Same product: gss-ntlmssp
Same vendor: gssapi
Same weakness: CWE-787