Amazon Linux 2 : libssh2 (ALAS-2019-1199)
high Nessus Plugin ID 124305
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New! Plugin Severity Now Using CVSS v3
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.(CVE-2019-3856)An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 in the way packets are read from the server.
A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.(CVE-2019-3855)
A vulnerability was found in in libssh2 where a server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used as an index to copy memory causing in an out of bounds memory write error.(CVE-2019-3863)
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.(CVE-2019-3857)
Solution
Run 'yum update libssh2' to update your system.See Also
Plugin Details
Severity: High
ID: 124305
File Name: al2_ALAS-2019-1199.nasl
Version: 1.2
Type: local
Agent: unix
Published: 4/26/2019
Updated: 1/22/2020
Dependencies: ssh_get_info.nasl
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 9.3
Temporal Score: 6.9
Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C
Temporal Vector: E:U/RL:OF/RC:C
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Temporal Vector: E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:libssh2, p-cpe:/a:amazon:linux:libssh2-debuginfo, p-cpe:/a:amazon:linux:libssh2-devel, p-cpe:/a:amazon:linux:libssh2-docs, cpe:/o:amazon:linux:2
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 4/26/2019
Vulnerability Publication Date: 3/21/2019
Reference Information
CVE: CVE-2019-3855, CVE-2019-3856, CVE-2019-3857, CVE-2019-3863
ALAS: 2019-1199