Rewterz Threat Advisory – Red Hat update for libssh2

Severity

Medium

Analysis Summary

CVE-2019-3863
A flaw was found in libssh2 before 1.8.1. 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-2019-3857
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 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-2019-3856
An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 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-2019-3855
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 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.

Impact

System access

Affected Vendors

RedHat

Affected Products

Red Hat Enterprise Linux Desktop 7
Red Hat Enterprise Linux HPC Node 7
Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux Workstation 7

Remediation

Updated packages are available via the Red Hat Network.

http://rhn.redhat.com