Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.
Problem types
CWE-122: Heap-based Buffer Overflow
CWE-131: Incorrect Calculation of Buffer Size
Product status
References
github.com/...reeRDP/security/advisories/GHSA-8469-2xcx-frf6
github.com/...ommit/dc7fdb165095139be779a4000199bc1706b06ad5