9.3 - RHSA-2019:2399

Problem Description:

An update for libssh2 is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support, Red Hat Enterprise Linux 7.3 Telco Extended Update Support, and Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server AUS (v. 7.3) - x86_64 Red Hat Enterprise Linux Server E4S (v. 7.3) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - noarch, x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.3) - noarch, ppc64le, x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.3) - noarch, x86_64 Red Hat Enterprise Linux Server TUS (v. 7.3) - x86_64

3. Description:

The libssh2 packages provide a library that implements the SSH2 protocol.

Security Fix(es):

* libssh2: Integer overflow in transport read resulting in out of bounds write (CVE-2019-3855)

* libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write (CVE-2019-3856)

* libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write (CVE-2019-3857)

* libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes (CVE-2019-3863)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1687303 - CVE-2019-3855 libssh2: Integer overflow in transport read resulting in out of bounds write 1687304 - CVE-2019-3856 libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write 1687305 - CVE-2019-3857 libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write 1687313 - CVE-2019-3863 libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes