LDAP slapd Denial-of-service (CVE-2020-36221 to CVE-2020-36230)

Advisory ID CVE Number Date discovered Severity Advisory revision
STORM-2021-010 CVE-2020-36221 , CVE-2020-36222 , CVE-2020-36223 , CVE-2020-36224 , CVE-2020-36225 , CVE-2020-36226 , CVE-2020-36227 , CVE-2020-36228 , CVE-2020-36229 , CVE-2020-36230 03/18/2021 medium v3

Vulnerability details

Multiples flaws were discovered in OpenLDAP before 2.4.57 leading to a slapd crash, resulting in a denial of service.

Impacted products

ProductsSeverityDetail
Stormshield Network Security medium SNS is impacted
Netasq medium NetAsq is impacted

Revisions

Version Date Description
v1  05/04/2021 Initial release
v2 05/05/2021 Typo fix in CVE numbers
v3 05/27/2021 Update fix versions

 



Stormshield Network Security

CVSS v3.1 Overall Score: 5.5      

Analysis

Impacted version

A malicious unauthenticated LDAP packet could lead to a slapd crash, resulting in a temporary denial of service.

 

 
  • SNS 2.0.0 to 2.7.9
  • SNS 2.8.0 to 2.16.0
  • SNS 3.0.0 to 3.7.19
  • SNS 3.8.0 to 3.11.7
  • SNS 4.1.5
  • SNS 4.2.1

Workaround solution

Solution

From SNS 3.3 and higher:

Ensure that your LDAP plugin is enabled, and the ldap_tcp:427 alarm is set to block.

The vulnerability is fixed in versions

  • SNS 3.7.20
  • SNS 3.11.8
  • SNS 4.1.6
  • SNS 4.2.2

 



Attack Vector Attack Complexity Privileges Required User Interaction Scope Confidentiality Impact Integrity Impact Availability impact
Network Low None None Unchanged None None Low
CVSS Base score: 5.3 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Exploit Code Maturity Remediation Level Report Confidence
Proof of concept code Official fix Confirmed
CVSS Temporal score: 4.8 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C)
Confidentiality Requirement Integrity Requirement Availability Requirement
High High High
CVSS Environmental score: 5.5 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C/CR:H/IR:H/AR:H/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X)


Netasq

CVSS v3.1 Overall Score: 5.5      

Analysis

Impacted version

A malicious unauthenticated LDAP packet could lead to a slapd crash, resulting in a temporary denial of service.

 
  • Netasq 9.1.10

Workaround solution

Solution

There is no workaround.

There is no solution.



Attack Vector Attack Complexity Privileges Required User Interaction Scope Confidentiality Impact Integrity Impact Availability impact
Network Low None None Unchanged None None Low
CVSS Base score: 5.3 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Exploit Code Maturity Remediation Level Report Confidence
Proof of concept code Official fix Confirmed
CVSS Temporal score: 4.8 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C)
Confidentiality Requirement Integrity Requirement Availability Requirement
High High High
CVSS Environmental score: 5.5 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C/CR:H/IR:H/AR:H/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X)