EulerOS 2.0 SP2 : tigervnc (EulerOS-SA-2017-1228)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote EulerOS host is missing multiple security updates.

Description :

According to the versions of the tigervnc packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

- A denial of service flaw was found in the TigerVNC's
Xvnc server. A remote unauthenticated attacker could
use this flaw to make Xvnc crash by terminating the TLS
handshake process early. (CVE-2016-10207)

- A double free flaw was found in the way TigerVNC
handled ClientFence messages. A remote, authenticated
attacker could use this flaw to make Xvnc crash by
sending specially crafted ClientFence messages,
resulting in denial of service. (CVE-2017-7393)

- A missing input sanitization flaw was found in the way
TigerVNC handled credentials. A remote unauthenticated
attacker could use this flaw to make Xvnc crash by
sending specially crafted usernames, resulting in
denial of service. (CVE-2017-7394)

- An integer overflow flaw was found in the way TigerVNC
handled ClientCutText messages. A remote, authenticated
attacker could use this flaw to make Xvnc crash by
sending specially crafted ClientCutText messages,
resulting in denial of service. (CVE-2017-7395)

- A buffer overflow flaw, leading to memory corruption,
was found in TigerVNC viewer. A remote malicious VNC
server could use this flaw to crash the client
vncviewer process resulting in denial of service.
(CVE-2017-5581)

- A memory leak flaw was found in the way TigerVNC
handled termination of VeNCrypt connections. A remote
unauthenticated attacker could repeatedly send
connection requests to the Xvnc server, causing it to
consume large amounts of memory resources over time,
and ultimately leading to a denial of service due to
memory exhaustion. (CVE-2017-7392)

- A memory leak flaw was found in the way TigerVNC
handled client connections. A remote unauthenticated
attacker could repeatedly send connection requests to
the Xvnc server, causing it to consume large amounts of
memory resources over time, and ultimately leading to a
denial of service due to memory exhaustion.
(CVE-2017-7396)

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.

See also :

http://www.nessus.org/u?d8f75642

Solution :

Update the affected tigervnc packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.0
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Huawei Local Security Checks

Nessus Plugin ID: 103086 ()

Bugtraq ID:

CVE ID: CVE-2016-10207
CVE-2017-5581
CVE-2017-7392
CVE-2017-7393
CVE-2017-7394
CVE-2017-7395
CVE-2017-7396

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