7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
5.1 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:H/Au:N/C:P/I:P/A:P
0.003 Low
EPSS
Percentile
69.4%
Severity: High
Date : 2021-07-01
CVE-ID : CVE-2021-21670 CVE-2021-21671
Package : jenkins
Type : multiple issues
Remote : Yes
Link : https://security.archlinux.org/AVG-2118
The package jenkins before version 2.300-1 is vulnerable to multiple
issues including authentication bypass and access restriction bypass.
Upgrade to 2.300-1.
The problems have been fixed upstream in version 2.300.
As a workaround for CVE-2021-21670, do not grant Item/Cancel permission
to users who do not have Item/Read permission. No known workaround
exists for CVE-2021-21671.
Jenkins 2.299 and earlier allows users to cancel queue items and abort
builds of jobs for which they have Item/Cancel permission even when
they do not have Item/Read permission. Jenkins 2.300 requires that
users have Item/Read permission for applicable types in addition to
Item/Cancel permission.
As a workaround on earlier versions of Jenkins, do not grant
Item/Cancel permission to users who do not have Item/Read permission.
Jenkins 2.299 and earlier does not invalidate the existing session on
login. This allows attackers to use social engineering techniques to
gain administrator access to Jenkins. Jenkins 2.300 invalidates the
existing session on login.
A remote attacker could login into an expired user session.
Additionally, users could cancel queue items and abort builds for which
they do not have Item/Read permission.
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2278
https://github.com/jenkinsci/jenkins/commit/86b7d7e789586575522650c60d591605facb1d70
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371
https://github.com/jenkinsci/jenkins/commit/25a42f3942fd9f8bd768c887c679dbc796b4fcd5
https://security.archlinux.org/CVE-2021-21670
https://security.archlinux.org/CVE-2021-21671
github.com/jenkinsci/jenkins/commit/25a42f3942fd9f8bd768c887c679dbc796b4fcd5
github.com/jenkinsci/jenkins/commit/86b7d7e789586575522650c60d591605facb1d70
security.archlinux.org/AVG-2118
security.archlinux.org/CVE-2021-21670
security.archlinux.org/CVE-2021-21671
www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2278
www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
5.1 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:H/Au:N/C:P/I:P/A:P
0.003 Low
EPSS
Percentile
69.4%