This vulnerability can trigger an out-of-bounds write, leading to memory corruption. This can lead to a denial of service if the write hits unmapped memory or randomly corrupts a byte in the application memory space. 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. Prior to version 1.2.0, memory corruption can be triggered when decoding UTF16 strings. GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication.
This will likely trigger an assertion failure in `free`, causing a denial-of-service. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point. The error condition incorrectly assumes the `cb` and `sh` buffers contain a copy of the data that needs to be freed. Prior to version 1.2.0, an incorrect free when decoding target information can trigger a denial of service. An attacker can leak memory via the main `gss_accept_sec_context` entry point, potentially causing a denial-of-service. The domain portion of a username may be overridden causing an allocated memory area the size of the domain name to be leaked. Prior to version 1.2.0, a memory leak can be triggered when parsing usernames which can trigger a denial-of-service.
The out-of-bounds read can be triggered via the main `gss_accept_sec_context` entry point and could cause a denial-of-service if the memory is unmapped. The length of the `av_pair` is not checked properly for two of the elements which can trigger an out-of-bound read. GSS-NTLMSSP, a mechglue plugin for the GSSAPI library that implements NTLM authentication, has an out-of-bounds read when decoding target information prior to version 1.2.0.
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