#VU50977 Open redirect in aiohttp - CVE-2021-21330

Vulnerability identifier: #VU50977

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-21330

CWE-ID: CWE-601

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
aiohttp
Other software / Other software solutions

Vendor: aio-libs

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

aiohttp: 3.0.0 - 3.7.3

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External links
https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25
https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96b
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg
https://pypi.org/project/aiohttp/
https://www.debian.org/security/2021/dsa-4864

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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.