Marvin attack in Linux kernel

1) Observable discrepancy

EUVDB-ID: #VU89003

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-6240

CWE-ID: CWE-203 - Observable discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a timing discrepancy when handling RSA based TLS key exchanges. A remote attacker can perform a Marvin attack and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://access.redhat.com/security/cve/CVE-2023-6240
https://bugzilla.redhat.com/show_bug.cgi?id=2250843
https://people.redhat.com/~hkario/marvin/
https://securitypitfalls.wordpress.com/2023/10/16/experiment-with-side-channel-attacks-yourself/
https://access.redhat.com/errata/RHSA-2024:1881
https://access.redhat.com/errata/RHSA-2024:1882

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.