SB2020042843 - Red Hat Enterprise Linux 8 update for GNOME

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Main Vulnerability Database SB2020042843

SB2020042843 - Red Hat Enterprise Linux 8 update for GNOME

Published: April 28, 2020

Security Bulletin ID SB2020042843
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 40% High 20% Low 40%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 vulnerabilities.


1) Stack-based buffer overflow (CVE-ID: CVE-2018-20337)

CWE-ID: CWE-121 - Stack-based buffer overflow

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


The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to stack-based buffer overflow in the parse_makernote function of dcraw_common.cpp. A remote attacker can trick the victim into opening a specially crafted input, trigger memory corruption and perform DoS attack.


2) Security restrictions bypass (CVE-ID: CVE-2019-3825)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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


The vulnerability allows a physical attacker to bypass security restrictions on the system.

The vulnerability exists due to improper security restrictions imposed by the affected software when timed login is enabled. A local attacker with physical access can select the timed login user and wait for the timer to expire that allows to bypass security restrictions and gain access to the logged-in user’s session on the targeted system.


3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-12447)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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:Red


The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to functionality in the daemon/gvfsbackendadmin.c file doesn't make use of "setfsuid" call when handling ownership permissions. A remote attacker can gain unauthorized access to arbitrary files on a system.


4) Race condition (CVE-ID: CVE-2019-12448)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/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 overwrite or access sensitive information, or cause a denial of service (DoS) condition on a targeted system.

The vulnerability exists due to race conditions in the daemon/gvfsbackendadmin.c source code file because the admin backend does not implement the query_info_on_read/write functionality. A remote attacker can send a request with malicious input to the system and cause race condition that will allow to overwrite or access sensitive information or cause a DoS condition.

5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-12449)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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:Red


The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to mishandling of file user and group ownership in the daemon/gvfsbackendadmin.c file. Operations "G_FILE_COPY_ALL_METADATA" from admin:// URIs to file:// URIs during move-and-copy are handled by the Gnome Input/Output (GIO) fallback code, which does not run with root permissions. A remote attacker can gain unauthorized access to arbitrary file information on a system.


Remediation

Install update from vendor's website.

References