CVE-2016-10012

openssh: Bounds check can be evaded in the shared memory manager used by pre-authentication compression support

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.

El administrador de memoria compartida (asociado con la compresión de pre-autenticación) en sshd en OpenSSH en versiones anteriores a 7.4 no asegura que una verificación de límites sea ejecutada por todos los compiladores, lo que podría permitir a usuarios locales obtener privilegios aprovechando el acceso a un proceso separado de privilegios aislado, relacionado con las estructuras de datos m_zback y m_zlib.

It was found that the boundary checks in the code implementing support for pre-authentication compression could have been optimized out by certain compilers. An attacker able to compromise the privilege-separated process could possibly use this flaw for further attacks against the privileged monitor process.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Attack Vector

Network

Attack Complexity

High

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-19 CVE Reserved
2016-12-25 CVE Published
2023-03-08 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-287: Improper Authentication

CAPEC

References (14)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2016/12/19/2	Mailing List
http://www.securityfocus.com/bid/94975	Vdb Entry
http://www.securitytracker.com/id/1037490	Vdb Entry
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html	Mailing List
https://security.netapp.com/advisory/ntap-20171130-0002
https://support.f5.com/csp/article/K62201745?utm_source=f5support&amp%3Butm_medium=RSS
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
https://www.openssh.com/txt/release-7.4

URL	Date	SRC

URL	Date	SRC
https://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9	2023-11-07

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2017:2029	2023-11-07
https://access.redhat.com/security/cve/CVE-2016-10012	2017-08-01
https://bugzilla.redhat.com/show_bug.cgi?id=1406293	2017-08-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				<= 7.3 Search vendor "Openbsd" for product "Openssh" and version " <= 7.3"		-		Affected