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MitreCVE-2021-31535

HistoryMay 27, 2021 - 1:15 p.m.

CVE-2021-31535

2021-05-2713:15:08

CWE-120

mitre

web.nvd.nist.gov

485

cve-2021-31535

x.org x

libx11

remote code execution

security vulnerability

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

7.7

Confidence

Low

EPSS

0.092

Percentile

94.8%

JSON

LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.

Affected configurations

Nvd

Node

x.orglibx11Range<1.7.1

x.orgx_window_systemRange≤x11r7.7

Node

fedoraprojectfedoraMatch33

VendorProductVersionCPE
x.orglibx11*cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*
x.orgx_window_system*cpe:2.3:o:x.org:x_window_system:*:*:*:*:*:*:*:*
fedoraprojectfedora33cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
x.org	libx11	*	cpe:2.3:a:x.org:libx11::::::::
x.org	x_window_system	*	cpe:2.3:o:x.org:x_window_system::::::::
fedoraproject	fedora	33	cpe:2.3:o:fedoraproject:fedora:33:::::::*