CVE-2026-63091— ProFTPD 缓冲区错误漏洞

ProFTPD mod_sftp Signed Integer Overflow via SCP Size-Record Parser

ProFTPD before 1.3.9c and 1.3.10rc3 contains a signed integer overflow vulnerability in the mod_sftp module's SCP size-record parser that allows authenticated low-privilege attackers to bypass ASLR by sending a crafted file size value of UINT64_MAX, which results in a negative off_t value. Attackers can exploit the subsequent conversion to uint32_t, causing an approximately 4 GB requested read length and forcing the server to read beyond the end of the SSH channel data and write overread process memory into the uploaded file. In tested configurations, the disclosed data contains libc, libcrypto, and PIE pointers sufficient to derive their randomized base addresses, thereby bypassing ASLR and enabling reliable exploitation of memory corruption vulnerabilities in the same process.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

整数溢出或超界折返

ProFTPD 缓冲区错误漏洞

ProFTPD是ProFTPD团队开源的一套可配置性强的开放源代码的FTP服务器软件。 ProFTPD 1.3.9c之前版本和1.3.10rc3之前版本存在安全漏洞，该漏洞源于mod_sftp模块的SCP size-record解析器存在有符号整数溢出，允许通过身份验证的低权限攻击者发送特制文件大小值UINT64_MAX，导致负off_t值，利用后续转换为uint32_t造成约4GB的请求读取长度，迫使服务器读取SSH通道数据末尾之外的内容并将过度读取的进程内存写入上传的文件，从而泄露libc、libcr

N/A

N/A