SB2019041516 - Fedora 28 update for libX11
Published: April 15, 2019 Updated: April 24, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2018-14600)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to out-of-bounds write when handling malicious input. A remote unauthenticated attacker can trick the victim into opening a specially crafted data, trigger memory corruption and execute arbitrary code on the target X client.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Improper input validation (CVE-ID: CVE-2018-14598)
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to an error when handling malicious input. A remote unauthenticated attacker can cause a remote server to return a specially crafted reply to cause the target X client to crash.
3) Off-by-one error (CVE-ID: CVE-2018-14599)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to an off-by-one memory write error in the XGetFontPath(), XListExtensions(), and XListFonts() functions. A remote unauthenticated attacker can cause a remote X server to return a specially crafted response to trigger memory corruption and execute arbitrary code on the target X client.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.