Synopsis
Important: libssh4 security update
Type/Severity
Security Advisory: Important
Topic
An update for libssh4 is now available for Red Hat Enterprise Linux 7.
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.
Description
The libssh4 packages provide a library that implements the SSH2 protocol.
Security Fix(es):
- libssh4: Integer overflow in transport read resulting in out of bounds write (CVE-2019-3855)
- libssh4: Integer overflow in keyboard interactive handling resulting in out of bounds write (CVE-2019-3856)
- libssh4: Integer overflow in SSH packet processing channel resulting in out of bounds write (CVE-2019-3857)
- libssh4: 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.
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 libssh4 must be restarted for this update to take effect.
Affected Products
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Red Hat Enterprise Linux Server 7 x86_64
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Red Hat Enterprise Linux Server - Extended Update Support 7.6 x86_64
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Red Hat Enterprise Linux Server - AUS 7.6 x86_64
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Red Hat Enterprise Linux Workstation 7 x86_64
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Red Hat Enterprise Linux Desktop 7 x86_64
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Red Hat Enterprise Linux for IBM z Systems 7 s390x
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Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
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Red Hat Enterprise Linux for Power, big endian 7 ppc64
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Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
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Red Hat Enterprise Linux for Scientific Computing 7 x86_64
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Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
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Red Hat Enterprise Linux for Power, little endian 7 ppc64le
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Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
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Red Hat Enterprise Linux Server - TUS 7.6 x86_64
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Red Hat Enterprise Linux for ARM 64 7 aarch64
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Red Hat Enterprise Linux for Power 9 7 ppc64le
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Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.6 ppc64le
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Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.6 x86_64
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Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x
Fixes
- BZ - 1687303 - CVE-2019-3855 libssh4: Integer overflow in transport read resulting in out of bounds write
- BZ - 1687304 - CVE-2019-3856 libssh4: Integer overflow in keyboard interactive handling resulting in out of bounds write
- BZ - 1687305 - CVE-2019-3857 libssh4: Integer overflow in SSH packet processing channel resulting in out of bounds write
- BZ - 1687313 - CVE-2019-3863 libssh4: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes
CVEs
References
Vulmon