CVE-2017-2624

X.org Privilege Escalation / Use-After-Free / Weak Entropy

Severity Score

7.0

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.

Se ha encontrado que xorg-x11-server en versiones anteriores a la 1.19.0 que uttilizan memcmp() para comprobar la cookie MIT recibida contra una serie de cookies válidas. Si la cookie es correcta, se puede adjuntar a la sesión de Xorg. Dado que la mayoría de las implementaciones de memcmp() retornan después de que se identifique un byte no válido, esto provoca una diferencia de tiempo entre un byte válido y otro no válido, lo que podría permitir un ataque de fuerza bruta eficiente.

X.org suffers from privilege escalation, weak entropy, and use-after-free vulnerabilities.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-01 CVE Reserved
2017-03-01 CVE Published
2023-07-21 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-385: Covert Timing Channel

CAPEC

References (8)

URL	Tag	Source
http://www.securityfocus.com/bid/96480	Third Party Advisory
http://www.securitytracker.com/id/1037919	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html	Mailing List

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624	2024-08-05
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg	2024-08-05

URL	Date	SRC
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c	2019-10-09

URL	Date	SRC
https://security.gentoo.org/glsa/201704-03	2019-10-09
https://security.gentoo.org/glsa/201710-30	2019-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
X.org Search vendor "X.org"		Xorg-server Search vendor "X.org" for product "Xorg-server"				<= 1.19.4 Search vendor "X.org" for product "Xorg-server" and version " <= 1.19.4"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0"		-		Affected