Multiple vulnerabilities in Apache Tomcat

1) Remote code execution

EUVDB-ID: #VU8541

Risk: High

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2017-12615

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

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

The weakness exists in Apache Tomcat when running on Windows with HTTP PUTs enabled (e.g. via setting the readonly initialisation parameter of the Default to false) due to input validation flaw. A remote attacker can send a specially crafted HTTP PUT request to upload an arbitrary JSP file to the target system and request the file to execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update to version 7.0.81.

Vulnerable software versions

Apache Tomcat: 7.0.0 - 7.0.80

External links

http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.81

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.

2) Information disclosure

EUVDB-ID: #VU8543

Risk: Low

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

CVE-ID: CVE-2017-12616

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists in the systems and resources using the VirtualDirContext due to input validation flaw. A remote attacker can send a specially crafted request to bypass security constraints and view JSP source code for resources on the target system served by the VirtualDirContext.

Successful exploitation of the vulnerability results in information disclosure.

Mitigation

Update to version 7.0.81.

Vulnerable software versions

Apache Tomcat: 7.0.0 - 7.0.80

External links

http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.81

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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