Ubuntu update for smarty3

1) Path traversal

EUVDB-ID: #VU61666

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-13982

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in Smarty_Security::isTrustedResourceDir(). A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation

Update the affected package smarty3 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

smarty3 (Ubuntu package): before 3.1.39-2ubuntu0.21.10.1

External links

http://ubuntu.com/security/notices/USN-5348-1

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.

2) PHP file inclusion

EUVDB-ID: #VU61663

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-16831

CWE-ID: CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program

Exploit availability: No

Description

The vulnerability allows a remote attacker to include and execute arbitrary PHP files on the server.

The vulnerability exists due to incorrect input validation when including PHP files. A remote non-authenticated attacker can send a specially crafted HTTP request to the affected application, bypass the trusted_dir protection mechanism via a file:./../ substring in an include statemen, include and execute arbitrary PHP code on the system with privileges of the web server.

Mitigation

Update the affected package smarty3 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

smarty3 (Ubuntu package): before 3.1.39-2ubuntu0.21.10.1

External links

http://ubuntu.com/security/notices/USN-5348-1

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) Code Injection

EUVDB-ID: #VU61665

Risk: Medium

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

CVE-ID: CVE-2021-21408

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote user with access to template can run restricted static PHP methods.

Mitigation

Update the affected package smarty3 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

smarty3 (Ubuntu package): before 3.1.39-2ubuntu0.21.10.1

External links

http://ubuntu.com/security/notices/USN-5348-1

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

4) Security restrictions bypass

EUVDB-ID: #VU50869

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-26119

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a remote user to escalate privileges within the application.

The vulnerability exists due to application does not properly impose security restrictions and allows to escape sandbox by allowing to access the $smarty.template_object. A remote user can perform template injection and execute arbitrary PHP code on the server.

Mitigation

Update the affected package smarty3 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

smarty3 (Ubuntu package): before 3.1.39-2ubuntu0.21.10.1

External links

http://ubuntu.com/security/notices/USN-5348-1

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

5) Code Injection

EUVDB-ID: #VU50870

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-26120

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote user to execute arbitrary PHP code on the target system.

The vulnerability exists due to improper input validation when processing data passed via an unexpected function name after a "{function name=" substring. A remote user can send a specially crafted request and execute arbitrary PHP code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected package smarty3 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

smarty3 (Ubuntu package): before 3.1.39-2ubuntu0.21.10.1

External links

http://ubuntu.com/security/notices/USN-5348-1

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

6) Code Injection

EUVDB-ID: #VU61664

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29454

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to execute arbitrary PHP code on the target system.

The vulnerability exists due to improper input validation. A remote user can inject a malicious math string into he PHP template and execute arbitrary PHP code on the system.

Mitigation

Update the affected package smarty3 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

smarty3 (Ubuntu package): before 3.1.39-2ubuntu0.21.10.1

External links

http://ubuntu.com/security/notices/USN-5348-1

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.