Full Disclosure mailing list archives

libheif v1.21.0 Out-of-Bounds Read in FullBox::get_flags


From: Ron E <ronaldjedgerson () gmail com>
Date: Sat, 23 Aug 2025 10:20:16 -0400

The FullBox::get_flags() method retrieves 24-bit flags from the underlying
box header. When a malformed box truncates the field, the function still
attempts to read three bytes. With insufficient data, this reads past valid
memory into uninitialized or out-of-bounds memory.

*Root Cause:*

   -

   No length validation before reading flag fields.

*Impact:*

   -

   Crash due to invalid memory access.
   -

   Potential leakage of heap memory values.

*Evidence:*

SUMMARY: AddressSanitizer: SEGV in FullBox::get_flags()
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/


Current thread: