Usage of weak PRNG in Rclone



Published: 2020-11-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-28924
CWE ID CWE-338
Exploitation vector Network
Public exploit N/A
Vulnerable software
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rclone
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Vendor rclone.org

Security Advisory

This security advisory describes one low risk vulnerability.

1) Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Risk: Low

CVSSv3: 3.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28924

CWE-ID: CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Exploit availability: No

Description

The vulnerability allows an attacker to decrypt or brute-force passwords.

The vulnerability exists due to Rclone uses a weak random number generator for generating passwords with much less entropy than advertised. An attacker, who is able to obtain the password protected file can decrypt data.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

rclone: 1.49.0, 1.49.1, 1.49.2, 1.49.3, 1.49.4, 1.49.5, 1.50.0, 1.50.1, 1.50.2, 1.51.0, 1.52.0, 1.52.1, 1.52.2, 1.52.3, 1.53.0, 1.53.1, 1.53.2

CPE External links

https://github.com/rclone/rclone/issues/4783
https://rclone.org/downloads/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.