SB2019102601 - Amazon Linux AMI update for patch
Published: October 26, 2019
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Improper input validation (CVE-ID: CVE-2018-1000156)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists in the EDITOR_PROGRAM invocation due to improper input validation. A remote attacker can send a specially crafted patch file and execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
2) OS Command Injection (CVE-ID: CVE-2018-20969)
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to the "do_ed_script" function in the "pch.c" file does not block strings beginning with a ! character. A remote unauthenticated attacker can trick a victim to open a specially crafted patch file and execute arbitrary OS shell commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) OS Command Injection (CVE-ID: CVE-2019-13638)
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to insufficient validation of ed style diff payload with shell metacharacters in patch files. A remote attacker can trick the victim to use a specially crafted patch file and execute arbitrary OS commands.
Remediation
Install update from vendor's website.