#VU87867 Out-of-bounds write in MongoDB - CVE-2021-32040

Vulnerability identifier: #VU87867

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2021-32040

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MongoDB
Server applications / Database software

Vendor: MongoDB, Inc.

Description

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

The vulnerability exists due to extremely long aggregation pipeline in conjunction with a specific stage/operator. A remote attacker can create a specially crafted file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MongoDB: 4.2.0 - 5.0.3

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External links
https://jira.mongodb.org/browse/SERVER-58203
https://jira.mongodb.org/browse/SERVER-60218
https://jira.mongodb.org/browse/SERVER-59299
https://security.netapp.com/advisory/ntap-20220609-0005/

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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.