Double-Free Vulnerability in OpenSSH Server 9.1 by OpenBSD
CVE-2023-25136

6.5MEDIUM

Key Information:

Vendor

Openssh

Status
Openssh
Vendor
CVE Published:
3 February 2023

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 90%

What is CVE-2023-25136?

OpenSSH Server 9.1 introduced a double-free vulnerability that occurs during the handling of options.kex_algorithms. An unauthenticated remote attacker can exploit this vulnerability when the server is in its default configuration, allowing potential access to arbitrary locations within the sshd address space. This flaw may enable remote code execution, posing a significant security risk to systems utilizing this version of OpenSSH. The issue has been resolved in OpenSSH version 9.2.

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-2023-25136
Created by Christbowel

CVE-2023-25136
Created by adhikara13

jfrog-CVE-2023-25136-OpenSSH_Double-Free
Created by jfrog

References

https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/01...
https://www.openwall.com/lists/oss-security/2023/02/02/2
https://bugzilla.mindrot.org/show_bug.cgi?id=3522

EPSS Score

90% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.