SB2020061303 - Gentoo update for ssvnc

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Main Vulnerability Database SB2020061303

SB2020061303 - Gentoo update for ssvnc

Published: June 13, 2020

Security Bulletin ID SB2020061303
CSH Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 25% Low 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Heap out-of-bounds write (CVE-ID: CVE-2018-20020)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 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/E:U/U:Amber


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

The vulnerability exists due to heap out-of-bounds write in inside structure in VNC client code. A remote attacker can trigger memory corruption and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.


2) Infinite loop (CVE-ID: CVE-2018-20021)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in VNC client code. A remote attacker can consume excessive amount of resources like CPU and RAM and perform a denial of service (DoS) attack.


3) Memory leak (CVE-ID: CVE-2018-20022)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due memory leak in VNC Repeater client code. A remote attacker can read stack memory and bypass ASLR.


4) NULL pointer dereference (CVE-ID: CVE-2018-20024)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in VNC client code. A remote attacker can perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References