Multiple integer overflows in the (1) vnc_connection_server_message and (2) vnc_color_map_set functions in gtk-vnc before 0.7.0 allow remote servers to cause a denial of service (crash) or possibly execute arbitrary code via vectors involving SetColorMapEntries, which triggers a buffer overflow.

The remote SUSE Linux SLED12 / SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3125-1 advisory.

  - 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. (CVE-2017-5884)

  - Multiple integer overflows in the (1) vnc_connection_server_message and (2) vnc_color_map_set functions in     gtk-vnc before 0.7.0 allow remote servers to cause a denial of service (crash) or possibly execute     arbitrary code via vectors involving SetColorMapEntries, which triggers a buffer overflow. (CVE-2017-5885)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the gtk-vnc packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - An integer overflow flaw was found in gtk-vnc. A remote     malicious VNC server could use this flaw to crash VNC     viewers which are based on the gtk-vnc     library.(CVE-2017-5885)

  - 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.(CVE-2017-5884)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the gtk-vnc package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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. (CVE-2017-5884)

  - An integer overflow flaw was found in gtk-vnc. A remote     malicious VNC server could use this flaw to crash VNC     viewers which are based on the gtk-vnc library.
    (CVE-2017-5885)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for gtk-vnc is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The gtk-vnc packages provide a VNC viewer widget for GTK. The gtk-vnc widget is built by using co-routines, which allows the widget to be completely asynchronous while remaining single-threaded.

The following packages have been upgraded to a later upstream version:
gtk-vnc (0.7.0). (BZ#1416783)

Security Fix(es) :

* 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. (CVE-2017-5884)

* An integer overflow flaw was found in gtk-vnc. A remote malicious VNC server could use this flaw to crash VNC viewers which are based on the gtk-vnc library. (CVE-2017-5885)

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

The following packages have been upgraded to a later upstream version:
gtk-vnc (0.7.0).

Security Fix(es) :

  - 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. (CVE-2017-5884)

  - An integer overflow flaw was found in gtk-vnc. A remote     malicious VNC server could use this flaw to crash VNC     viewers which are based on the gtk-vnc library.
    (CVE-2017-5885)

From Red Hat Security Advisory 2017:2258 :

An update for gtk-vnc is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The gtk-vnc packages provide a VNC viewer widget for GTK. The gtk-vnc widget is built by using co-routines, which allows the widget to be completely asynchronous while remaining single-threaded.

The following packages have been upgraded to a later upstream version:
gtk-vnc (0.7.0). (BZ#1416783)

Security Fix(es) :

* 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. (CVE-2017-5884)

* An integer overflow flaw was found in gtk-vnc. A remote malicious VNC server could use this flaw to crash VNC viewers which are based on the gtk-vnc library. (CVE-2017-5885)

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

Security fix for CVE-2017-5884, CVE-2017-5885

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It was discovered that gtk-vnc incorrectly validated certain data. A malicious server could use this issue to cause gtk-vnc to crash, resulting in a denial of service, or possibly execute arbitrary code.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Josef Gajdusek discovered two vulnerabilities in gtk-vnc, a VNC viewer widget for GTK :

CVE-2017-5884

Fix bounds checking for RRE, hextile & copyrec encodings. This bug allowed a remote server to cause a denial of service by buffer overflow via a carefully crafted message containing subrectangles outside the drawing area.

CVE-2017-5885

Correctly validate color map range indexes. This bug allowed a remote server to cause a denial of service by buffer overflow via a carefully crafted message with out-of-range colour values.

For Debian 7 'Wheezy', these problems have been fixed in version 0.5.0-3.1+deb7u1.

We recommend that you upgrade your gtk-vnc packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Daniel P. Berrange reports :

CVE-2017-5884 - fix bounds checking for RRE, hextile and copyrect encodings

CVE-2017-5885 - fix color map index bounds checking.

ID	Name	Product	Family	Severity
153468	SUSE SLED12 / SLES12 Security Update : gtk-vnc (SUSE-SU-2021:3125-1)	Nessus	SuSE Local Security Checks	critical
140958	EulerOS Virtualization for ARM 64 3.0.6.0 : gtk-vnc (EulerOS-SA-2020-2010)	Nessus	Huawei Local Security Checks	critical
103020	EulerOS 2.0 SP2 : gtk-vnc (EulerOS-SA-2017-1182)	Nessus	Huawei Local Security Checks	critical
103019	EulerOS 2.0 SP1 : gtk-vnc (EulerOS-SA-2017-1181)	Nessus	Huawei Local Security Checks	critical
102757	CentOS 7 : gtk-vnc (CESA-2017:2258)	Nessus	CentOS Local Security Checks	critical
102644	Scientific Linux Security Update : gtk-vnc on SL7.x x86_64 (20170801)	Nessus	Scientific Linux Local Security Checks	critical
102301	Oracle Linux 7 : gtk-vnc (ELSA-2017-2258)	Nessus	Oracle Linux Local Security Checks	critical
102153	RHEL 7 : gtk-vnc (RHSA-2017:2258)	Nessus	Red Hat Local Security Checks	critical
97620	Fedora 25 : mingw-gtk-vnc (2017-c3739273e5)	Nessus	Fedora Local Security Checks	critical
97617	Fedora 24 : mingw-gtk-vnc (2017-404f1a29fc)	Nessus	Fedora Local Security Checks	critical
97537	Fedora 24 : gtk-vnc (2017-a9e6a5c249)	Nessus	Fedora Local Security Checks	critical
97303	Ubuntu 14.04 LTS : gtk-vnc vulnerabilities (USN-3203-1)	Nessus	Ubuntu Local Security Checks	critical
97236	Debian DLA-831-1 : gtk-vnc security update	Nessus	Debian Local Security Checks	critical
97174	Fedora 25 : gtk-vnc (2017-ab04a91edd)	Nessus	Fedora Local Security Checks	critical
97107	FreeBSD : gtk-vnc -- bounds checking vulnerabilities (79bbb8f8-f049-11e6-8a6a-bcaec565249c)	Nessus	FreeBSD Local Security Checks	critical

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