Use-After-Free Vulnerability in Tor by The Tor Project
CVE-2018-0491

7.5HIGH

Key Information:

Vendor

Torproject

Status
Tor
Vendor
CVE Published:
5 March 2018

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-0491?

A use-after-free vulnerability was identified in the Tor software, specifically in versions 0.3.2.x prior to 0.3.2.10. This flaw allows attackers to exploit the KIST implementation, enabling them to add a communication channel to the pending list multiple times. Consequently, this can lead to a denial of service, causing the Tor relay to crash and potentially disrupt the network's functionality.

Affected Version(s)

Tor Tor

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2018-0491 - Proof of Concept

References

https://trac.torproject.org/projects/tor/ticket/24700
x_refsource_CONFIRM
https://trac.torproject.org/projects/tor/ticket/25117
x_refsource_CONFIRM
https://blog.torproject.org/new-stable-tor-releases-secur...
x_refsource_CONFIRM

EPSS Score

8% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.