GSS-NTLMSSP vulnerable to multiple out-of-bounds reads when decoding NTLM fields

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

跨界内存读

GSS-NTLMSSP 缓冲区错误漏洞

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。

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