CVE-2021-20184 - Improper Validation of Integrity Check Value

Severity

43%

Complexity

27%

Confidentiality

23%

It was found in Moodle before version 3.10.1, 3.9.4 and 3.8.7 that a insufficient capability checks in some grade related web services meant students were able to view other students grades.

CVSS 3.1 Base Score 4.3. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).

CVSS 2.0 Base Score 4. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:S/C:P/I:N/A:N).

Demo Examples

Improper Validation of Integrity Check Value

CWE-354

The following example demonstrates the weakness.


               
}

                     
if (inet_ntoa(cli.sin_addr)==...) n = recvfrom(sd, msg, MAX_MSG, 0, (struct sockaddr *) & cli, &clilen);

               
}
socket.send(sendPacket);

Overview

First reported 4 years ago

2021-01-28 19:15:00

Last updated 4 years ago

2021-02-01 14:55:00

Affected Software

Moodle

References

https://moodle.org/mod/forum/discuss.php?d=417167

https://moodle.org/mod/forum/discuss.php?d=417167

Patch, Vendor Advisory

Stay updated

ExploitPedia is constantly evolving. Sign up to receive a notification when we release additional functionality.

Get in touch

If you'd like to report a bug or have any suggestions for improvements then please do get in touch with us using this form. We will get back to you as soon as we can.