Ubuntu update for nginx

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU46107

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-11724

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests in ngx_http_lua_subrequest.c in lua-nginx-module for OpenResy. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation

Update the affected package nginx to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 21.10

nginx-full (Ubuntu package): before 1.14.0-0ubuntu1.10

libnginx-mod-http-lua (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-core (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-extras (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-light (Ubuntu package): before 1.14.0-0ubuntu1.10

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:
• cpe:2.3:o:canonical:ubuntu:21.10:*:*:*:*:*:*:
• cpe:2.3:o:canonical:nginx-full_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:libnginx-mod-http-lua_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-core_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-extras_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-light_ubuntu_package:*:*:*:*:*:ubuntu:*:

External links

http://ubuntu.com/security/notices/USN-5371-1

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) Input validation error

EUVDB-ID: #VU62316

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-36309

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing URI in HTTP requests. A remote attacker can send a specially crafted HTTP request to the server and modify its response. As a result, an attacker can perform spoofing attack.

Mitigation

Update the affected package nginx to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 21.10

nginx-full (Ubuntu package): before 1.14.0-0ubuntu1.10

libnginx-mod-http-lua (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-core (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-extras (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-light (Ubuntu package): before 1.14.0-0ubuntu1.10

CPE2.3

• cpe:2.3:o:canonical:nginx-full_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:libnginx-mod-http-lua_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-core_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-extras_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-light_ubuntu_package:*:*:*:*:*:ubuntu:*:

External links

http://ubuntu.com/security/notices/USN-5371-1

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.

3) Origin validation error

EUVDB-ID: #VU59319

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3618

CWE-ID: CWE-346 - Origin Validation Error

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a logic error in TLS implementation when handling different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A remote attacker with ability to perform TCP/IP layer MitM attack can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer.

This attack technique was dubbed ALPACA (application layer protocol content confusion attack).

Mitigation

Update the affected package nginx to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 21.10

nginx-full (Ubuntu package): before 1.14.0-0ubuntu1.10

libnginx-mod-http-lua (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-core (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-extras (Ubuntu package): before 1.14.0-0ubuntu1.10

nginx-light (Ubuntu package): before 1.14.0-0ubuntu1.10

CPE2.3

• cpe:2.3:o:canonical:nginx-full_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:libnginx-mod-http-lua_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-core_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-extras_ubuntu_package:*:*:*:*:*:ubuntu:*:
• cpe:2.3:o:canonical:nginx-light_ubuntu_package:*:*:*:*:*:ubuntu:*:

External links

http://ubuntu.com/security/notices/USN-5371-1

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.