Integer Overflow in libssh2 SSH Protocol Implementation
CVE-2019-13115

8.1HIGH

Key Information:

Vendor

Libssh2

Status
Libssh2
Vendor
CVE Published:
16 July 2019

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 42%

What is CVE-2019-13115?

An integer overflow vulnerability exists in the key exchange implementation of libssh2 prior to version 1.9.0. This flaw arises in the kex_method_diffie_hellman_group_exchange_sha256_key_exchange function within the kex.c file, where an out-of-bounds read may occur during packet processing from SSH servers. A malicious actor exploiting this weakness could disclose sensitive information or potentially disrupt services for clients connecting to compromised SSH servers. The issue is related to a mistake in the _libssh2_check_length function and is distinct from previously resolved vulnerabilities.

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.

Libssh2-Exploit
Created by viz27

References

https://github.com/libssh2/libssh2/pull/350
https://libssh2.org/changes.html
https://github.com/libssh2/libssh2/compare/02ecf17...42d37aa

EPSS Score

42% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.