Denial of service in Siemens TIM 1531 IRC



Published: 2021-06-10
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2018-0732
CWE ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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TIM 1531 IRC
Hardware solutions / Firmware

Vendor Siemens

Security Advisory

This security advisory describes one low risk vulnerability.

1) Improper input validation

Risk: Low

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

CVE-ID: CVE-2018-0732

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to improper handling of large prime values by the affected software during key agreement operations in a Transport Layer Security (TLS) handshake using an Ephemeral Diffie-Hellman (DHE) based cipher suite. A remote attacker can send a large prime value from a malicious OpenSSL server to a targeted OpenSSL client and cause the client to stop responding while generating a key for the prime value.

Mitigation

Install update from vendor's website.

Vulnerable software versions

TIM 1531 IRC: before 2.2

CPE External links

https://ics-cert.us-cert.gov/advisories/icsa-21-159-08
https://cert-portal.siemens.com/productcert/txt/ssa-419820.txt

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.



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