Synology-SA-21:13 Samba AD DC

Abstract

Multiple vulnerabilities allow remote attackers and remote authenticated users to conduct denial-of-service attacks via a susceptible version of Synology Directory Server.

Affected Products

Mitigation

None

Detail

• CVE-2020-27840

  • Severity: Important
  • CVSS3 Base Score: 7.5
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.

• CVE-2021-20277

  • Severity: Important
  • CVSS3 Base Score: 7.1
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
  • A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.

Reference

• Samba Releases Security Updates
• CVE-2020-27840
• CVE-2021-20277

Revision