CVE-2019-13115 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Reference

https://blog.semmle.com/libssh2-integer-overflow/ https://github.com/libssh2/libssh2/compare/02ecf17…42d37aa https://github.com/libssh2/libssh2/pull/350 https://libssh2.org/changes.html https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/ https://security.netapp.com/advisory/ntap-20190806-0002/ https://support.f5.com/csp/article/K13322484 https://support.f5.com/csp/article/K13322484?utm_source=f5support&utm_medium=RSS

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

HIGH

Base Severity

8.1