CVE-2019-17498 Information

Description

In libssh2 v1.9.0 and earlier versions the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted 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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/ https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498 https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.cL480 https://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c https://lists.debian.org/debian-lts-announce/2019/11/msg00010.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB/

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