CyberSecBulletin
CVE-2023-28686NVD status: Modified

Dino: Authorization Bypass Through User-Controlled Key

Published Updated By the CyberSecBulletin desk

CVE-2023-28686 is a high-severity authorization bypass through user-controlled key vulnerability in Dino, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists versions 0.2.3, 0.3.2, 0.4.2 as the first without the flaw, so updating Dino to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.7% chance of exploitation within 30 days, higher than 54% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Dino to 0.2.3 or 0.3.2 or 0.4.2, whichever matches your release line, or a later version.
  2. Read the advisory on dino.im for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  4. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
DinoDinobefore 0.2.3; 0.3.0 up to, but not including, 0.3.2; 0.4.0 up to, but not including, 0.4.20.2.3, 0.3.2, 0.4.2
Fedora ProjectFedora36; 37; 38Not stated
DebianDebian Linux10.0; 11.0; 12.0Not stated

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
LowLimited modification of data is possible.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.1HighNVD
CVSS 3.15.3MediumCISA (ADP)

Official description

Dino before 0.2.3, 0.3.x before 0.3.2, and 0.4.x before 0.4.2 allows attackers to modify the personal bookmark store via a crafted message. The attacker can change the display of group chats or force a victim to join a group chat; the victim may then be tricked into disclosing sensitive information.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Authorization Bypass Through User-Controlled Key

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.

How developers prevent this class of flaw

  • For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
  • Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.
  • Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.

More Authorization Bypass Through User-Controlled Key vulnerabilities (CWE-639)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Authorization Bypass Through User-Controlled Key vulnerabilities

Spotted an error? Tell us.