CVE-2026-48855— Erlang/OTP 信息泄露漏洞

SFTP READLINK Leaks Absolute Backend Filesystem Path When Root Is Configured

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery. The SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without calling chroot_filename/2 to strip the backend root prefix. An authenticated SFTP client can create a symlink inside the chroot pointing to /; ssh_sftpd resolves the target to the absolute backend root and stores it on disk. Reading the symlink back via SSH_FXP_READLINK returns that absolute path, for example /data/sftp, instead of the chrooted value /. The information disclosed is the absolute filesystem path of the SFTP root directory and of any symlink targets within it. No file contents, credentials, or access to paths outside the root directory are obtainable through this issue alone. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl. This issue affects OTP from OTP 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to ssh from 3.0.1 before 6.0.1, 5.5.2.1 and 5.2.11.8.

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信息暴露

Erlang/OTP 信息泄露漏洞

Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP ssh 3.0.1至6.0.1之前版本、5.5.2.1版本和5.2.11.8版本存在信息泄露漏洞，该漏洞源于ssh_sftpd模块中SSH_FXP_READLINK处理程序在发送file:read_link/2结果时未调用chroot_filename/2去除后端根前缀，可能导致已认证SFTP客户端获取绝对文件系统路径信息。

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