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https://github.com/The-Z-Labs/linux-exploit-suggester
Linux privilege escalation auditing tool
https://github.com/The-Z-Labs/linux-exploit-suggester
applicable-exploits exploits hacking-tool kernel-exploitation linux-exploits linux-kernel privilege-escalation-exploits published-exploits security-tools
Last synced: about 2 months ago
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Linux privilege escalation auditing tool
- Host: GitHub
- URL: https://github.com/The-Z-Labs/linux-exploit-suggester
- Owner: The-Z-Labs
- License: gpl-3.0
- Created: 2016-10-06T21:55:51.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2024-02-17T11:44:50.000Z (7 months ago)
- Last Synced: 2024-05-21T14:11:52.723Z (4 months ago)
- Topics: applicable-exploits, exploits, hacking-tool, kernel-exploitation, linux-exploits, linux-kernel, privilege-escalation-exploits, published-exploits, security-tools
- Language: Shell
- Homepage:
- Size: 385 KB
- Stars: 5,310
- Watchers: 127
- Forks: 1,071
- Open Issues: 20
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG
- License: LICENSE
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README
## LES: Linux privilege escalation auditing tool
Quick download:
wget https://raw.githubusercontent.com/mzet-/linux-exploit-suggester/master/linux-exploit-suggester.sh -O les.sh
Details about LES usage and inner workings:
https://mzet-.github.io/2019/05/10/les-paper.html
Additional resources for the LES:
https://github.com/mzet-/les-res
## Purpose
LES tool is designed to assist in detecting security deficiencies for a given Linux kernel/Linux-based machine. It provides following functionality:
### Assessing kernel exposure on publicly known exploits
Tool assesses (using heuristics methods discussed in details [here](https://mzet-.github.io/2019/05/10/les-paper.html)) exposure of the given kernel to publicly known Linux kernel exploits. Example of tool output:
```
$ ./linux-exploit-suggester.sh
...
[+] [CVE-2017-16995] eBPF_verifier
Details: https://ricklarabee.blogspot.com/2018/07/ebpf-and-analysis-of-get-rekt-linux.html
Exposure: highly probable
Tags: debian=9.0{kernel:4.9.0-3-amd64},fedora=25|26|27,[ ubuntu=14.04 ]{kernel:4.4.0-89-generic},ubuntu=(16.04|17.04){kernel:4.(8|10).0-(19|28|45)-generic}
Download URL: https://www.exploit-db.com/download/45010
Comments: CONFIG_BPF_SYSCALL needs to be set && kernel.unprivileged_bpf_disabled != 1
[+] [CVE-2017-1000112] NETIF_F_UFO
Details: http://www.openwall.com/lists/oss-security/2017/08/13/1
Exposure: probable
Tags: [ ubuntu=14.04{kernel:4.4.0-*} ],ubuntu=16.04{kernel:4.8.0-*}
Download URL: https://raw.githubusercontent.com/xairy/kernel-exploits/master/CVE-2017-1000112/poc.c
ext-url: https://raw.githubusercontent.com/bcoles/kernel-exploits/cve-2017-1000112/CVE-2017-1000112/poc.c
Comments: CAP_NET_ADMIN cap or CONFIG_USER_NS=y needed. SMEP/KASLR bypass included. Modified version at 'ext-url' adds support for additional distros/kernels
[+] [CVE-2016-8655] chocobo_root
Details: http://www.openwall.com/lists/oss-security/2016/12/06/1
Exposure: probable
Tags: [ ubuntu=(14.04|16.04){kernel:4.4.0-(21|22|24|28|31|34|36|38|42|43|45|47|51)-generic} ]
Download URL: https://www.exploit-db.com/download/40871
Comments: CAP_NET_RAW capability is needed OR CONFIG_USER_NS=y needs to be enabled
...
```
For each exploit, exposure is calculated. Following 'Exposure' states are possible:
- **Highly probable** - assessed kernel is most probably affected and there's a very good chance that PoC exploit will work out of the box without any major modifications.
- **Probable** - it's possible that exploit will work but most likely customization of PoC exploit will be needed to suit your target.
- **Less probable** - additional manual analysis is needed to verify if kernel is affected.
- **Unprobable** - highly unlikely that kernel is affected (exploit is not displayed in the tool's output)
### Verifying state of kernel hardening security measures
LES can check for most of security settings available by your Linux kernel. It verifies not only the kernel compile-time configurations (CONFIGs) but also verifies run-time settings (sysctl) giving more complete picture of security posture for running kernel. This functionality is modern continuation of `--kernel` switch from [checksec.sh](http://www.trapkit.de/tools/checksec.html) tool by Tobias Klein. Example of tool output:
```
$ ./linux-exploit-suggester.sh --checksec
Mainline kernel protection mechanisms:
[ Disabled ] GCC stack protector support (CONFIG_HAVE_STACKPROTECTOR)
https://github.com/mzet-/les-res/blob/master/features/stackprotector-regular.md
[ Disabled ] GCC stack protector STRONG support (CONFIG_STACKPROTECTOR_STRONG)
https://github.com/mzet-/les-res/blob/master/features/stackprotector-strong.md
[ Enabled ] Low address space to protect from user allocation (CONFIG_DEFAULT_MMAP_MIN_ADDR)
https://github.com/mzet-/les-res/blob/master/features/mmap_min_addr.md
[ Disabled ] Restrict unprivileged access to kernel syslog (CONFIG_SECURITY_DMESG_RESTRICT)
https://github.com/mzet-/les-res/blob/master/features/dmesg_restrict.md
[ Enabled ] Randomize the address of the kernel image (KASLR) (CONFIG_RANDOMIZE_BASE)
https://github.com/mzet-/les-res/blob/master/features/kaslr.md
[ Disabled ] Hardened user copy support (CONFIG_HARDENED_USERCOPY)
https://github.com/mzet-/les-res/blob/master/features/hardened_usercopy.md
...
```
## Usage
Assess exposure of the Linux box to publicly known exploits:
```
$ ./linux-exploit-suggester.sh
```
Show state of security features on the Linux box:
```
$ ./linux-exploit-suggester.sh --checksec
```
Assess exposure of Linux kernel on publicly known exploits based on the provided 'uname' string (i.e. output of `uname -a` command):
```
$ ./linux-exploit-suggester.sh --uname
```
For more usage examples, see [here](https://mzet-.github.io/2019/05/10/les-paper.html).
## Getting involved
You hopefully now know what LES is and what it can do for you. Now see what you can do for LES:
- Add newly published Linux privilege escalation exploits to it.
- Test existing exploits on various Linux distributions with multiple kernel versions, then document your findings in a form of `Tags` in LES, e.g. of a tag: `ubuntu=12.04{kernel:3.(2|5).0-(23|29)-generic}` which states: *tagged exploit was verifed to work correctly on Ubuntu 12.04 with kernels: 3.2.0-23-generic, 3.2.0-29-generic, 3.5.0-23-generic and 3.5.0-29-generic;*. With this tag added LES will automatically highlight and bump dynamic `Rank` of the exploit when run on Ubuntu 12.04 with one of listed kernel versions. This will help you (and others) during pentests to rapidly identify critically vulnerable Linux machines.
- Published exploits are often written only for PoC purposes only for one (or couple of) specific Linux distributions and/or kernel version(s). Pick sources of the exploit of choice and customize it to run on different kernel version(s). Then add your customized version of exploit as `ext-url` entry to LES and modify `Tags` to reflect newly added targets. See [this](https://ricklarabee.blogspot.com/2017/12/adapting-poc-for-cve-2017-1000112-to.html) article for an excellent example of adapting specific PoC exploit to different kernel versions.
- Conduct source code analysis of chosen kernel hardening security measure then add it to the `FEATURES` array (if not already there) and publish your analysis at: `https://github.com/mzet-/les-res/blob/master/features/.md`.
### Acknowledgments
[bcoles](https://github.com/bcoles/) for his excellent and frequent contributions to LES.