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CVE-2021-43820

7.4 · HIGH

Seafile is an open source cloud storage system.

Published Dec 14, 2021CWE-639EPSS 0.99%

Overview

CVE-2021-43820 is a high-severity vulnerability. It was published on December 14, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Seafile is an open source cloud storage system. A sync token is used in Seafile file syncing protocol to authorize access to library data. To improve performance, the token is cached in memory in seaf-server. Upon receiving a token from sync client or SeaDrive client, the server checks whether the token exist in the cache. However, if the token exists in cache, the server doesn't check whether it's associated with the specific library in the URL. This vulnerability makes it possible to use any valid sync token to access data from any **known** library. Note that the attacker has to first find out the ID of a library which it has no access to. The library ID is a random UUID, which is not possible to be guessed. There are no workarounds for this issue.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/haiwen/seafile-server/pull/520GitHubgithub.com/haiwen/seafile-server/security/advisories/GHSA-m3wc-jv6r-hvv8GitHubgithub.com/haiwen/seafile-server/pull/520GitHubgithub.com/haiwen/seafile-server/security/advisories/GHSA-m3wc-jv6r-hvv8

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43820?

CVE-2021-43820 is a high-severity vulnerability. It was published on December 14, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2021-43820?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43820?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43820?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43820 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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