SB2020051150 - OpenSUSE Linux update for LibVNCServer

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Memory leak (CVE-ID: CVE-2019-15681)

The vulnerability allows a remote attacker to gain access to sensitive information on the target system.

The vulnerability exists due memory leak in VNC server code. A remote attacker can read stack memory and disclose sensitive information.

Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR.

2) Heap-based buffer overflow (CVE-ID: CVE-2019-15690)

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 heap-based buffer overflow and execute arbitrary code on the target system.

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

3) Integer overflow (CVE-ID: CVE-2019-20788)

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

The vulnerability exists due to integer overflow in libvncclient/cursor.c  when processing large height or width values. A remote attacker can trick the victim to connect to a malicious VNC server, trigger integer overflow and execute arbitrary code on the target system.

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

Remediation

Install update from vendor's website.

References

• https://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html