MGASA-2023-0318

This issue affects Clients only: Integer underflow leading to DOS (e.g. abort due to WINPR_ASSERT with default compilation flags). When an insufficient blockLen is provided, and proper length validation is not performed, an Integer Underflow occurs, leading to a Denial of Service (DOS) vulnerability. (CVE-2023-39350)

Affected versions of FreeRDP are subject to a Null Pointer Dereference leading a crash in the RemoteFX (rfx) handling. Inside the rfx_process_message_tileset function, the program allocates tiles using rfx_allocate_tiles for the number of numTiles. If the initialization process of tiles is not completed for various reasons, tiles will have a NULL pointer. Which may be accessed in further processing and would cause a program crash. (CVE-2023-39351)

Affected versions are subject to a missing offset validation leading to Out Of Bound Read. In the libfreerdp/codec/rfx.c file there is no offset validation in tile->quantIdxY, tile->quantIdxCb, and tile->quantIdxCr. As a result crafted input can lead to an out of bounds read access which in turn will cause a crash. (CVE-2023-39353)

Affected versions are subject to an Out-Of-Bounds Read in the nsc_rle_decompress_data function. The Out-Of-Bounds Read occurs because it processes context->Planes without checking if it contains data of sufficient length. Should an attacker be able to leverage this vulnerability they may be able to cause a crash. (CVE-2023-39354)

Affected versions are subject to an Integer-Underflow leading to Out-Of-Bound Read in the zgfx_decompress_segment function. In the context of CopyMemory, it's possible to read data beyond the transmitted packet range and likely cause a crash. (CVE-2023-40181)

Affected versions are subject to an IntegerOverflow leading to Out-Of-Bound Write Vulnerability in the gdi_CreateSurface function. This issue affects FreeRDP based clients only. FreeRDP proxies are not affected as image decoding is not done by a proxy. (CVE-2023-40186)

Affected versions are subject to an Out-Of-Bounds Read in the general_LumaToYUV444 function. This Out-Of-Bounds Read occurs because processing is done on the in variable without checking if it contains data of sufficient length. Insufficient data for the in variable may cause errors or crashes. (CVE-2023-40188)

Affected versions are subject to an Out-Of-Bounds Write in the clear_decompress_bands_data function in which there is no offset validation. Abuse of this vulnerability may lead to an out of bounds write. (CVE-2023-40567)

Affected versions are subject to an Out-Of-Bounds Write in the progressive_decompress function. This issue is likely down to incorrect calculations of the nXSrc and nYSrc variables. (CVE-2023-40569)

In affected versions there is a Global-Buffer-Overflow in the ncrush_decompress function. Feeding crafted input into this function can trigger the overflow which has only been shown to cause a crash. (CVE-2023-40589)