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Data exfiltration via Ransack query injection

High
hellcp published GHSA-2wwv-c6xh-cf68 Jan 9, 2023

Package

travel-support-program (Deployment)

Affected versions

< d22916275c51500b4004933ff1b0a69bc807b2b7

Patched versions

>= d22916275c51500b4004933ff1b0a69bc807b2b7

Description

Impact

Sensitive user data (Bank Account Details, Password Hash) can be extracted via Ransack query injection. Every deployment of travel-support-program below the patched version is affected.

The travel-support-program uses the Ransack library to implement search functionality.
In its default configuration, Ransack will allow for query conditions based on properties of associated database objects [1]. The *_start, *_end or *_cont search matchers [2] can then be abused to exfiltrate sensitive string values of associated database objects via character-by-character brute-force (A match is indicated by the returned JSON not being empty). A single bank account number can be extracted with <200 requests, a password hash can be extracted with ~1200 requests, all within a few minutes.

Patches

The problem has been patched in commit d229162

Workarounds

In order to work around this issue, you can also cherry pick that patch, however it will not work without the Rails 5.0 migration that was done in #150, which in turn had quite a few pull requests it depended on.

References

[1] https://activerecord-hackery.github.io/ransack/going-further/associations/
[2] https://activerecord-hackery.github.io/ransack/getting-started/search-matches/

Credit

The vulnerability was reported to us by Lukas Euler from Positive Security. Thank you!

Severity

High
7.5
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVE ID

CVE-2022-46163

Weaknesses

No CWEs