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CVE-2019-13115

8.1 · HIGH

In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the…

Published Jul 16, 2019CWE-125EPSS 11.66%

Overview

CVE-2019-13115 is a high-severity vulnerability. It was published on July 16, 2019 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/172834/libssh2-1.8.2-Out-Of-Bounds-Read.htmlRefblog.semmle.com/libssh2-integer-overflow/GitHubgithub.com/libssh2/libssh2/compare/02ecf17...42d37aaGitHubgithub.com/libssh2/libssh2/pull/350Reflibssh2.org/changes.htmlReflists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3EReflists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3EReflists.debian.org/debian-lts-announce/2019/07/msg00024.htmlReflists.debian.org/debian-lts-announce/2021/12/msg00013.htmlReflists.debian.org/debian-lts-announce/2023/09/msg00006.html

How CyberStrike helps

Frequently asked questions

What is CVE-2019-13115?

CVE-2019-13115 is a high-severity vulnerability. It was published on July 16, 2019 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2019-13115?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-13115?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-13115?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-13115 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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