Multiple vulnerabilities in Jenkins and LTS

1) Clickjacking

EUVDB-ID: #VU24764

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2105

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a clickjacking attack

The vulnerability exists due to the affected software does not serve the "X-Frame-Options: deny" HTTP header on REST API responses to protect against clickjacking attacks. A remote attacker can rout the victim through a specially crafted web page that embeds a REST API endpoint in an iframe and trick the user to perform an action which would allow for the attacker to learn the content of that REST API endpoint.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.218

Jenkins LTS: 2.7.1 - 2.204.1

External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1704

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU24763

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2104

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to the access to the chart requires no permissions beyond the general Overall/Read. A remote user with Overall/Read permission can gain unauthorized access to JVM memory usage data.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.218

Jenkins LTS: 2.7.1 - 2.204.1

External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1650

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Information disclosure

EUVDB-ID: #VU24762

Risk: Low

CVSSv3.1: 3.1 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2103

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the affected software exposes session identifiers on a user's detail object in the "/whoAmI" diagnostic page. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.218

Jenkins LTS: 2.7.1 - 2.204.1

External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1695

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Cryptographic issues

EUVDB-ID: #VU24761

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2102

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the affected software does not use a constant-time comparison when checking whether two HMACs are equal. A remote authenticated attacker can use statistical methods to obtain a valid HMAC for an attacker-controlled input value.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.218

Jenkins LTS: 2.7.1 - 2.204.1

External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1660

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Information disclosure

EUVDB-ID: #VU24760

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2101

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the affected software does not use a constant-time comparison validating the connection secret when an inbound TCP agent connection is initiated. A remote authenticated attacker can use statistical methods to obtain the connection secret.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.218

Jenkins LTS: 2.7.1 - 2.204.1

External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1659

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Resource management error

EUVDB-ID: #VU24759

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-2100

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the UDP multicast/broadcast service can be used in an amplification reflection attack. A remote attacker can send spoofed UDP packets and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.218

Jenkins LTS: 2.7.1 - 2.204.1

External links

http://www.openwall.com/lists/oss-security/2020/01/29/1
http://jenkins.io/security/advisory/2020-01-29/#SECURITY-1641

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.