Synology-SA-21:17 Samba

Abstract

A vulnerability allows remote authenticated users to bypass security constraint via a susceptible version of DiskStation Manager (DSM) or Synology Router Manager (SRM).

Affected Products

Mitigation

None

Detail

• CVE-2021-20254
  • Severity: Moderate
  • CVSS3 Base Score: 6.8
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
  • A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.

Reference

• Samba Releases Security Updates
• CVE-2021-20254

Revision