Heap out-of-bounds write in LibVNCServer - CVE-2018-20749

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Main Vulnerability Database Vulnerabilities #VU17751

Heap out-of-bounds write in LibVNCServer - CVE-2018-20749

Published: February 18, 2019 / Updated: November 25, 2019


Vulnerability identifier: #VU17751
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-20749
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. A remote attacker can trigger out-of-bounds write in rfbserver.c and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

LibVNCServer
Opensuse
Ubuntu
SIMATIC ITC2200 PRO
SIMATIC ITC2200
SIMATIC ITC1900 PRO
SIMATIC ITC1900
SIMATIC ITC1500 PRO
SIMATIC ITC1500
italc-client (Ubuntu package)
italc-master (Ubuntu package)
libitalccore (Ubuntu package)

How to mitigate CVE-2018-20749

Update to version 0.9.12.

LibVNCServer - update to 0.9.12
SIMATIC ITC2200 PRO - update to
italc-client (Ubuntu package) - update to 1:3.0.3+dfsg1-3ubuntu0.1
italc-master (Ubuntu package) - update to 1:3.0.3+dfsg1-3ubuntu0.1
libitalccore (Ubuntu package) - update to 1:3.0.3+dfsg1-3ubuntu0.1
SIMATIC ITC2200 PRO - update to 3.2.1.0
SIMATIC ITC2200 - update to 3.2.1.0
SIMATIC ITC1900 PRO - update to 3.2.1.0
SIMATIC ITC1900 - update to 3.2.1.0
SIMATIC ITC1500 PRO - update to 3.2.1.0
SIMATIC ITC1500 - update to 3.2.1.0

External References

Related Security Bulletins