Vulnerability Name:

CVE-2021-26562 (CCN-197539)

Assigned:2020-11-26
Published:2020-11-26
Updated:2022-04-26
Summary:Out-of-bounds write vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary code via syno_finder_site HTTP header.
CVSS v3 Severity:8.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:6.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
7.6 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-787
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-26562

Source: XF
Type: UNKNOWN
synology-cve202126562-code-exec(197539)

Source: CCN
Type: Synology-SA-20:26
DSM

Source: CONFIRM
Type: Vendor Advisory
https://www.synology.com/security/advisory/Synology_SA_20_26

Source: MISC
Type: Exploit, Third Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1159

Vulnerable Configuration:Configuration 1:
  • cpe:/a:synology:diskstation_manager:*:*:*:*:*:*:*:* (Version < 6.2.3-25426-3)

    • Configuration 2:
  • cpe:/o:synology:vs960hd_firmware:-:*:*:*:*:*:*:*
  • AND
  • cpe:/h:synology:vs960hd:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:synology:skynas_firmware:-:*:*:*:*:*:*:*
  • AND
  • cpe:/h:synology:skynas:-:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:synology:diskstation_manager_unified_controller:3.0:*:*:*:*:*:*:*
  • AND
  • cpe:/h:synology:uc3200:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    synology diskstation manager *
    synology vs960hd firmware -
    synology vs960hd -
    synology skynas firmware -
    synology skynas -
    synology diskstation manager unified controller 3.0
    synology uc3200 -