Denial of service in IBM Db2 Web Query for i

1) Infinite loop

EUVDB-ID: #VU59051

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-45105

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 within the StrSubstitutor class. A remote attacker can pass specially crafted input to the application, consume all available system resources and cause denial of service conditions.

Payload example: ${${::-${::-$${::-j}}}}

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM Db2 Web Query for i: 2.2.1 - 2.3.0

CPE2.3

• cpe:2.3:a:ibm_corporation:ibm_db2_web_query_for_i:2.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:ibm_corporation:ibm_db2_web_query_for_i:2.3.0:*:*:*:*:*:*:*

External links

https://www.ibm.com/blogs/psirt/security-bulletin-a-vulnerability-in-apache-log4j-affects-ibm-db2-web-query-for-i-cve-2021-45105/

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