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Medium 5.3
UltraVNC repeater integer overflow in win_log malloc leading to heap overflow
UltraVNC repeater through 1.8.2.2 contains an integer overflow in the HTTP request logging path. In repeater/webgui/settings.c:336, the win_log() function allocates list nodes via malloc(sizeof(struct LIST) + strlen(line)), where line is derived from HTTP req…
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Medium 4.8
UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes
UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes() function seeds libc rand() with time(0) + getpid() + rand() and generates a 16-…
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Medium 4.3
UltraVNC vncWc2Mb calls wcslen() before validating that the wide string is NUL-terminated
UltraVNC through 1.8.2.2 contains an out-of-bounds read in the wide-string to multibyte conversion helper. In rfb/dh.cpp:204, the vncWc2Mb() function passes a caller-supplied WCHAR pointer to wcslen() before any bounds check. If the caller provides a wide-cha…