CVE-2021-39138
published 2021-08-19CVE-2021-39138: Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Developers can use the REST API to signup users and…
PriorityP337medium6.5CVSS 3.1
AVNACLPRNUINSUCLILAN
EPSS
0.99%
58.2th percentile
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Developers can use the REST API to signup users and also allow users to login anonymously. Prior to version 4.5.1, when an anonymous user is first signed up using REST, the server creates session incorrectly. Particularly, the `authProvider` field in `_Session` class under `createdWith` shows the user logged in creating a password. If a developer later depends on the `createdWith` field to provide a different level of access between a password user and anonymous user, the server incorrectly classified the session type as being created with a `password`. The server does not currently use `createdWith` to make decisions about internal functions, so if a developer is not using `createdWith` directly, they are not affected. The vulnerability only affects users who depend on `createdWith` by using it directly. The issue is patched in Parse Server version 4.5.1. As a workaround, do not use the `createdWith` Session field to make decisions if one allows anonymous login.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| parse-community | parse-server | < 4.5.1 | 4.5.1 |
| parse-community | parse-server | >= 0 < 4.5.2 | 4.5.2 |
| parseplatform | parse-server | < 4.5.1 | 4.5.1 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
nvdv2.06.4MEDIUMAV:N/AC:L/Au:N/C:P/I:P/A:N
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
parse-server new anonymous user session acts as if it's created with password
ghsa·2021-08-23
CVE-2021-39138 [MEDIUM] CWE-287 parse-server new anonymous user session acts as if it's created with password
parse-server new anonymous user session acts as if it's created with password
### Impact
Developers that use the REST API to signup users and also allow users to login anonymously. When an anonymous user is first signed up using REST, the server creates session incorrectly, particularly the `authProvider` field in `_Session` class under `createdWith` shows the user logged in creating a password. If a developer later depends on the `createdWith` field to provide a different level of access between a password user and anonymous user, the server incorrectly classified the session type as being created with a `password`.
The server currently doesn't use `createdWith` to make decisions on how things work internally, so if a developer isn't using `createdWith` directly, there's nothing to wor
OSV
parse-server new anonymous user session acts as if it's created with password
osv·2021-08-23
CVE-2021-39138 [MEDIUM] parse-server new anonymous user session acts as if it's created with password
parse-server new anonymous user session acts as if it's created with password
### Impact
Developers that use the REST API to signup users and also allow users to login anonymously. When an anonymous user is first signed up using REST, the server creates session incorrectly, particularly the `authProvider` field in `_Session` class under `createdWith` shows the user logged in creating a password. If a developer later depends on the `createdWith` field to provide a different level of access between a password user and anonymous user, the server incorrectly classified the session type as being created with a `password`.
The server currently doesn't use `createdWith` to make decisions on how things work internally, so if a developer isn't using `createdWith` directly, there's nothing to wor
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/parse-community/parse-server/commit/147bd9a3dc43391e92c36e05d5db860b04ca27dbhttps://github.com/parse-community/parse-server/releases/tag/4.5.1https://github.com/parse-community/parse-server/security/advisories/GHSA-23r4-5mxp-c7g5https://github.com/parse-community/parse-server/commit/147bd9a3dc43391e92c36e05d5db860b04ca27dbhttps://github.com/parse-community/parse-server/releases/tag/4.5.1https://github.com/parse-community/parse-server/security/advisories/GHSA-23r4-5mxp-c7g5
2021-08-19
Published