ALAS-2019-1254


Amazon Linux AMI Security Advisory: ALAS-2019-1254
Advisory Release Date: 2019-08-12 18:11 Pacific
Severity: Important

Issue Overview:

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 )

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 )

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 )

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-2019-3863 )


Affected Packages:

libssh2


Issue Correction:
Run yum update libssh2 to update your system.

New Packages:
i686:
    libssh2-1.4.2-3.12.amzn1.i686
    libssh2-debuginfo-1.4.2-3.12.amzn1.i686
    libssh2-devel-1.4.2-3.12.amzn1.i686
    libssh2-docs-1.4.2-3.12.amzn1.i686

src:
    libssh2-1.4.2-3.12.amzn1.src

x86_64:
    libssh2-devel-1.4.2-3.12.amzn1.x86_64
    libssh2-docs-1.4.2-3.12.amzn1.x86_64
    libssh2-1.4.2-3.12.amzn1.x86_64
    libssh2-debuginfo-1.4.2-3.12.amzn1.x86_64