Multiple vulnerabilities in cflinuxfs3



Published: 2021-06-18
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2018-16869
CVE-2021-3580
CWE-ID CWE-300
CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe
cflinuxfs3
Other software / Other software solutions

Vendor Cloud Foundry Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Cache Attacks

EUVDB-ID: #VU16222

Risk: Medium

CVSSv3.1: 7.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-16869

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a downgrade attack on the server and decrypt private keys on the target system.

The vulnerability exists due to a core weakness in TLS that relates to the handshaking of the session key which is used within the tunnel during parallelisation of thousands of oracle queries that occurs using a cluster of TLS servers which share the same public key certificate. A remote attacker can mount a microarchitectural side channel attack against a vulnerable implementation, obtain a network man-in-the-middle position, obtain the relevant data to sign and trigger the victim server to decrypt ciphertexts chosen by the adversary to perform a downgrade attack.






Mitigation

Install update from vendor's website.

Vulnerable software versions

cflinuxfs3: 0.0.0 - 0.243.0

External links

http://github.com/cloudfoundry/cflinuxfs3/releases/tag/0.244.0


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. However, proof of concept for this vulnerability is available.

2) Input validation error

EUVDB-ID: #VU53978

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3580

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists in nettle's RSA decryption functions due to insufficient validation of certain ciphertexts. A remote attacker can send specially crafted  data to the server and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

cflinuxfs3: 0.0.0 - 0.243.0

External links

http://github.com/cloudfoundry/cflinuxfs3/releases/tag/0.244.0


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.



###SIDEBAR###