CVE-2021-43820

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Summary

CVECVE-2021-43820
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-12-14 19:15:00 UTC
Updated2021-12-21 17:17:00 UTC
DescriptionSeafile 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.

Risk And Classification

Problem Types: CWE-639

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Seafile Seafile Server All All All All
Application Seafile Seafile Server All All All All

References

ReferenceSourceLinkTags
Sync token can be used to access data from other libraries · Advisory · haiwen/seafile-server · GitHub CONFIRM github.com
Validate repo_id when validate token from cache by feiniks · Pull Request #520 · haiwen/seafile-server · GitHub MISC github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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