CVE-2017-5884

gtk-vnc: Improper check of framebuffer boundaries when processing a tile

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

gtk-vnc before 0.7.0 does not properly check boundaries of subrectangle-containing tiles, which allows remote servers to execute arbitrary code via the src x, y coordinates in a crafted (1) rre, (2) hextile, or (3) copyrect tile.

gtk-vnc en versiones anteriores a 0.7.0 no comprueba adecuadamente los límites de azulejos que contienen sub rectángulo, lo que permite a servidores remotos ejecutar código arbitrario a través de las coordenadas src x, y en un azulejo (1) rre, (2) hextile o (3) copyrect manipulado.

It was found that gtk-vnc lacked proper bounds checking while processing messages using RRE, hextile, or copyrect encodings. A remote malicious VNC server could use this flaw to crash VNC viewers which are based on the gtk-vnc library.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-02-04 CVE Reserved
2017-02-20 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-118: Incorrect Access of Indexable Resource ('Range Error')
CWE-787: Out-of-bounds Write

CAPEC

References (9)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2017/02/03/5	Mailing List
http://www.openwall.com/lists/oss-security/2017/02/05/5	Mailing List
http://www.securityfocus.com/bid/96016	Third Party Advisory

URL	Date	SRC
https://bugzilla.gnome.org/show_bug.cgi?id=778048	2024-08-05

URL	Date	SRC
https://git.gnome.org/browse/gtk-vnc/commit/?id=ea0386933214c9178aaea9f2f85049ea3fa3e14a	2023-02-12

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2017:2258	2023-02-12
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LGPQ5MQR6SN4DYTEFACHP2PP5RR26KYK	2023-02-12
https://access.redhat.com/security/cve/CVE-2017-5884	2017-08-01
https://bugzilla.redhat.com/show_bug.cgi?id=1418944	2017-08-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				25 Search vendor "Fedoraproject" for product "Fedora" and version "25"		-		Affected
Gnome Search vendor "Gnome"		Gtk-vnc Search vendor "Gnome" for product "Gtk-vnc"				<= 0.6.0 Search vendor "Gnome" for product "Gtk-vnc" and version " <= 0.6.0"		-		Affected