https://github.com/mbadanoiu/cve-2020-8249

CVE-2020-8249: Buffer Overflow in Pulse Secure VPN Linux Client
https://github.com/mbadanoiu/cve-2020-8249

0-day buffer-overflow cve cve-2020-8249 cves local-privilege-escalation

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CVE-2020-8249: Buffer Overflow in Pulse Secure VPN Linux Client

• Host: GitHub
• URL: https://github.com/mbadanoiu/cve-2020-8249
• Owner: mbadanoiu
• Created: 2023-11-26T13:28:07.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2023-11-26T15:10:59.000Z (12 months ago)
• Last Synced: 2023-11-26T17:26:12.547Z (12 months ago)
• Topics: 0-day, buffer-overflow, cve, cve-2020-8249, cves, local-privilege-escalation
• Homepage:
• Size: 1.37 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# CVE-2020-8249: Buffer Overflow in Pulse Secure VPN Linux Client

The root SUID executable pulsesvc, has a function “do_upload” that unsafely calls a “sprintf” which can result in a buffer overflow. Because the “sprintf” writes the values on the stack, if a big enough string is passed to it, then it can result in the overwrite of the legitimate Return Address written on the stack.

### NVD Disclosure:

The NVD disclosure for this vulnerability can be found [here](https://nvd.nist.gov/vuln/detail/CVE-2020-8249).

### Requirements:

The exploit targets code that is accessed post client authentication, that means that in order to exploit this vulnerability an attacker would require one of the 3 scenarios:

- Hosting an attacker-controlled Pulse VPN Server

- A valid SSL/TLS certificate to host a dummy VPN server (Can be easily done with solutions such as “Let’s Encrypt”)

- Connecting to a legitimate Pulse VPN Server (User credentials/Client certificates may be found directly on the compromised client)

### Proof Of Concept:

More details and the exploitation process can be found in this [PDF](https://github.com/mbadanoiu/CVE-2020-8249/blob/main/Pulse%20Secure%20VPN%20Linux%20Client%20-%20CVE-2020-8249.pdf).