SB2021042002 - Multiple vulnerabilities in Synology DiskStation Manager (DSM)
Published: April 20, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Cleartext transmission of sensitive information (CVE-ID: CVE-2021-26560)
CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to software uses insecure communication channel to transmit sensitive information within the synoagentregisterd server finder functionality. A remote attacker can perform a man-in-the-middle attack and gain access to sensitive data.
2) Stack-based buffer overflow (CVE-ID: CVE-2021-26561)
CWE-ID: CWE-121 - Stack-based buffer overflow
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 execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing "syno_finder_site" HTTP header. A remote unauthenticated attacker can perform a man-in-the-middle attack, trigger stack-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) Out-of-bounds write (CVE-ID: CVE-2021-26562)
CWE-ID: CWE-787 - Out-of-bounds write
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 compromise vulnerable system.
The vulnerability exists due to a boundary error when processing "syno_finder_site" HTTP header. A remote attacker can perform a man-in-the-middle attack, trigger out-of-bounds write and execute arbitrary code on the target system.
4) Improper access control (CVE-ID: CVE-2021-26563)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:U/U:Clear
The vulnerability allows a local user to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in AppArmor’s synosearchagent profile. A local administrator can use a specially crafted kernel module to bypass the AppArmor’s restrictions.
5) Cleartext transmission of sensitive information (CVE-ID: CVE-2021-26564)
CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to software uses insecure communication channel to transmit sensitive information in synorelayd. A remote attacker can perform a man-in-the-middle attack to spoof servers via an HTTP session.
6) Cleartext transmission of sensitive information (CVE-ID: CVE-2021-26565)
CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to software uses insecure communication channel to transmit sensitive information in synorelayd. A remote attacker can perform a man-in-the-middle attack to obtain sensitive information via an HTTP session.
7) Command Injection (CVE-ID: CVE-2021-26566)
CWE-ID: CWE-77 - Command injection
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/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 commands on the target system.
The vulnerability exists due to insertion of sensitive information into sent data issue in synorelayd. A remote attacker can perform a man-in-the-middle attack to execute arbitrary commands via inbound QuickConnect traffic.
Remediation
Install update from vendor's website.