CVE-2015-3146

Publication date 5 May 2015

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The (1) SSH_MSG_NEWKEYS and (2) SSH_MSG_KEXDH_REPLY packet handlers in package_cb.c in libssh before 0.6.5 do not properly validate state, which allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted SSH packet.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libssh	15.10 wily	Fixed 0.6.3-3ubuntu3.2
	15.04 vivid	Ignored end of life
	14.10 utopic	Ignored end of life
	14.04 LTS trusty	Fixed 0.6.1-0ubuntu3.3
	12.04 LTS precise	Fixed 0.5.2-1ubuntu0.12.04.6

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libssh	Upstream: https://www.libssh.org/security/patches/CVE-2015-3146-libssh-0.5.5.patch

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-2912-1
libssh vulnerabilities
23 February 2016