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Multiple vulnerabilities in Siemens SIMATIC CP 1543-1



Published: 2020-02-12
Severity Medium
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2019-18217
CVE-2019-12815
CWE ID CWE-835
CWE-284
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
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SIMATIC CP 1543-1
Hardware solutions / Firmware

Vendor Siemens

Security Advisory

1) Infinite loop

Severity: Medium

CVSSv3: 4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-18217

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop in main.c in a child process when handling overly long commands. A remote non-authenticated attacker can perform a denial of service attack by sending an overly log command to the affected FTP server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC CP 1543-1: 2.0, 2.1

CPE External links

https://ics-cert.us-cert.gov/advisories/icsa-20-042-03

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) Permissions, Privileges, and Access Controls

Severity: Medium

CVSSv3: 5.9 [CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-12815

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: Yes [Search exploit]

Description

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

The vulnerability exists due to the application does not honor <Limit READ> and <Limit WRITE> configurations for SITE CPFR and SITE CPTO commands in the mod_copy module. A remote authenticated user with read permissions (e.g. user anonymous) can read contents of an arbitrary file on the server.



Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC CP 1543-1: 2.0, 2.1

CPE External links

https://ics-cert.us-cert.gov/advisories/icsa-20-042-03

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. However, proof of concept for this vulnerability is available.