Fix: reported issues in the scanner

[jjnicola]

SC-1649

• Fix: useragent in nasl_http2.c. Reported as an use-after-free issue, but the problem was that I was using the wrong variable. Now uses the right one ua
• Fix: avoid stack overflow when password length is greater than 21
• Fix: check buffer lenght before memcpy
• Fix: OOB read in nasl_crypt.c
• Fix: nasl_ntlmv2_hash(). Do length validation.
• Fix:nasl_snmp.c: read() return stored in size_t
• Fix: use-after-free in nasl_snmpv1v2c_get()
• Fix: Stack overflow in nasl_win_cmd_exec()
• Fix: OOB read / potential heap overflow nasl_packet_forgery*

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✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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