CyberRota Analysis
AI-GeneratedA vulnerability exists in the SFTP backend of gvfs, where a malicious SFTP server can exploit uninitialized heap memory during the mounting of a share. This flaw allows the server to read sensitive information from the client, undermining Address Space Layout Randomization (ASLR) and potentially exposing system memory addresses. Organizations using gvfs for SFTP connections should prioritize patching this vulnerability to mitigate the risk of data leakage and exploitation.
Original NVD Description
A flaw was found in the SFTP backend in gvfs. When mounting a share, a malicious SFTP server can cause read_string() to allocate a buffer with a certain length but the function does not verify that the buffer is completely filled, leaving the remainder of the buffer containing uninitialized heap contents. If the server sends a short FXP_HANDLE reply, these uninitialized bytes are taken as the file handle. The client will then echo these uninitialized bytes back to the server on all subsequent requests using that handle. With a length of 128 bytes, this issue allows the malicious server to deterministically read uninitialized heap memory from the gvfsd-sftp process, leaking its heap base and the load address of the libgio library, resulting in a deterministic defeat of Address Space Layout Randomization (ASLR).