CVE-2019-13115

Public Exploit

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.

Category

8.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 43.27% Top 5%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory libssh2.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/libssh2/libssh2/pull/350 third party advisory issue tracking
https://libssh2.org/changes.html release notes vendor advisory
https://github.com/libssh2/libssh2/compare/02ecf17...42d37aa third party advisory
https://blog.semmle.com/libssh2-integer-overflow/ third party advisory exploit
https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/ vendor advisory
https://security.netapp.com/advisory/ntap-20190806-0002/ third party advisory
https://support.f5.com/csp/article/K13322484 third party advisory
https://support.f5.com/csp/article/K13322484?utm_source=f5support&%3Butm_medium=RSS
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E mailing list
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E mailing list
https://lists.debian.org/debian-lts-announce/2021/12/msg00013.html third party advisory mailing list
http://packetstormsecurity.com/files/172834/libssh2-1.8.2-Out-Of-Bounds-Read.html
https://lists.debian.org/debian-lts-announce/2023/09/msg00006.html mailing list

Frequently Asked Questions

What is the severity of CVE-2019-13115?
CVE-2019-13115 has been scored as a high severity vulnerability.
How to fix CVE-2019-13115?
To fix CVE-2019-13115, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-13115 being actively exploited in the wild?
It is possible that CVE-2019-13115 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~43% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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