Buffer Over-Read

The X.org server is vulnerable to Buffer Over-read. The vulnerability is due to improper handling of byte-swapped length values in the ProcAppleDRICreatePixmap() function, potentially leading to memory leakage and segmentation faults, especially when triggered by a client with a different endianness. An attacker could exploit this vulnerability to cause the X server to read heap memory values and transmit them back to the client until encountering an unmapped page, resulting in a crash. Despite the attacker’s inability to control the specific memory copied into the replies, the small length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds reads.