Vulnerability-Lookup

RHSA-2016:0566

Vulnerability from csaf_redhat - Published: 2016-03-31 23:20 - Updated: 2025-11-21 17:55

Summary

Red Hat Security Advisory: libssh security update

Severity

Moderate

Notes

Topic: An update for libssh is now available for Red Hat Enterprise Linux 7 Extras. Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

Details: libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fix(es): * A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters. (CVE-2016-0739) Red Hat would like to thank Aris Adamantiadis for reporting this issue.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2016-0739

A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters.

5.8 ()


                        
                          AV:N/AC:M/Au:N/C:P/I:P/A:N

CWE-704 - Incorrect Type Conversion or Cast

Vendor Fix 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 libssh must be restarted for this update to take effect. https://access.redhat.com/errata/RHSA-2016:0566

References

URL

Category

	https://access.redhat.com/errata/RHSA-2016:0566	self
	https://access.redhat.com/security/updates/classi…	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1305971	external
	https://security.access.redhat.com/data/csaf/v2/a…	self
	https://access.redhat.com/security/cve/CVE-2016-0739	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1305971	external
	https://www.cve.org/CVERecord?id=CVE-2016-0739	external
	https://nvd.nist.gov/vuln/detail/CVE-2016-0739	external
	https://www.libssh.org/security/advisories/CVE-20…	external

Acknowledgments

Aris Adamantiadis

JSON

To clipboard

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}

CVE-2016-0739 (GCVE-0-2016-0739)

Vulnerability from cvelistv5 – Published: 2016-04-13 17:00 – Updated: 2024-08-05 22:30

Summary

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

Severity ?

No CVSS data available.

CWE

Assigner

redhat

References

URL

Tags

	http://lists.fedoraproject.org/pipermail/package-…	vendor-advisoryx_refsource_FEDORA
	http://www.ubuntu.com/usn/USN-2912-1	vendor-advisoryx_refsource_UBUNTU
	https://www.libssh.org/security/advisories/CVE-20…	x_refsource_CONFIRM
	https://puppet.com/security/cve/CVE-2016-0739	x_refsource_CONFIRM
	http://lists.fedoraproject.org/pipermail/package-…	vendor-advisoryx_refsource_FEDORA
	https://security.gentoo.org/glsa/201606-12	vendor-advisoryx_refsource_GENTOO
	http://www.debian.org/security/2016/dsa-3488	vendor-advisoryx_refsource_DEBIAN
	http://rhn.redhat.com/errata/RHSA-2016-0566.html	vendor-advisoryx_refsource_REDHAT
	https://www.libssh.org/2016/02/23/libssh-0-7-3-se…	x_refsource_CONFIRM
	http://lists.opensuse.org/opensuse-updates/2016-0…	vendor-advisoryx_refsource_SUSE

Date Public ?

2016-02-23 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2016:0566

CVE-2016-0739 (GCVE-0-2016-0739)

Tags

Sightings

Nomenclature