CVE-2026-12391— ubuntu-pro-client Local Privilege Escalation and Information Disclosure via Symlink Arbitrary File Read in collect-logs

ubuntu-pro-client Local Privilege Escalation and Information Disclosure via Symlink Arbitrary File Read in collect-logs

An insecure symlink following vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools) within the pro collect-logs command framework. The utility creates or utilizes predictable temporary file paths or user-accessible log directories when gathering diagnostic information without verifying the file type or ownership. An unprivileged local attacker can exploit this behavior by creating a symbolic link (symlink) at a predictable destination path pointing to an arbitrary, root-readable file (such as /etc/shadow or private files within /root). When a root administrator or operator subsequently executes the pro collect-logs command, the tool follows the user-controlled symlink, reads the target file, and compresses its contents into the resulting diagnostic support archive. Because the output archive remains readable by the unprivileged user, the attacker can extract and read the sensitive root-owned files, leading to a complete information disclosure of system secrets.

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

在文件访问前对链接解析不恰当(链接跟随)

Canonical ubuntu-advantage-tools 后置链接漏洞

Canonical ubuntu-advantage-tools是英国Canonical公司的一款系统管理工具套件。 Canonical ubuntu-advantage-tools 37.3之前版本存在后置链接漏洞，该漏洞源于pro collect-logs命令框架中存在不安全的符号链接跟随问题，工具在收集诊断信息时使用可预测的临时文件路径或用户可访问的日志目录，而未验证文件类型或所有权，导致低权限的本地攻击者可通过在可预测目标路径创建指向任意root可读文件的符号链接，当root管理员执行pro co

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