Synology-SA-21:17 Samba

Publish Time: 2021-05-03 10:54:54 UTC+8

Last Updated: 2021-05-06 03:28:17 UTC+8

Severity
Moderate
Status
Ongoing

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

Product Severity Fixed Release Availability
DSM 6.2 Moderate Ongoing
SkyNAS Moderate Ongoing
VS960HD Not affected N/A
SRM 1.2 Moderate Ongoing

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

Revision

Revision Date Description
1 2021-05-03 Initial public release.