Vulnerability Details : CVE-2021-43820

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.
Published 2021-12-14 19:15:08
Updated 2021-12-21 17:17:44
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2021-43820

Exploit prediction scoring system (EPSS) score for CVE-2021-43820

EPSS FAQ
0.15%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 52 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-43820

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.3
 MEDIUM AV:N/AC:M/Au:N/C:P/I:N/A:N
8.6
2.9
 NIST
5.9
 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.2
3.6
 NIST
7.4
 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
2.2
5.2
 GitHub, Inc.

CWE ids for CVE-2021-43820

  • The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-43820

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