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Fix gss_process_context_token() [CVE-2014-5352]
[MITKRB5-SA-2015-001] The krb5 gss_process_context_token() should not actually delete the context; that leaves the caller with a dangling pointer and no way to know that it is invalid. Instead, mark the context as terminated, and check for terminated contexts in the GSS functions which expect established contexts. Also add checks in export_sec_context and pseudo_random, and adjust t_prf.c for the pseudo_random check. (back ported from commit 82dc33d) ticket: 8067 (new) version_fixed: 1.12.3 status: resolved
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