Denial of service in Red Hat OpenShift Service Mesh 2.0 for RHEL 8

1) Input validation error

EUVDB-ID: #VU48480

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28362

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 due to insufficient validation of user-supplied input in a number of math/big.Int methods (Div, Exp, DivMod, Quo, Rem, QuoRem, Mod, ModInverse, ModSqrt, Jacobi, and GCD). A remote attacker can pass large input data to the application, specifically as divisor or modulo argument larger than 3168 bits (on 32-bit architectures) or 6336 bits (on 64-bit architectures).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenShift Service Mesh: 2.0.2

servicemesh-proxy (Red Hat package): 0.12.0-3.el8

servicemesh-cni (Red Hat package): 0.12.0-6.el8

servicemesh-operator (Red Hat package): before 2.0.2-3.el8

servicemesh (Red Hat package): before 2.0.2-1.el8

CPE2.3

• cpe:2.3:a:red_hat:openshift_service_mesh:2.0.2:*:*:*:*:*:*:
• cpe:2.3:o:red_hat:servicemesh-proxy_redhat_package:0.12.0-3.el8:*:*:*:*:red_hat_enterprise_linux:*:
• cpe:2.3:o:red_hat:servicemesh-cni_redhat_package:0.12.0-6.el8:*:*:*:*:red_hat_enterprise_linux:*:

External links

http://access.redhat.com/errata/RHBA-2021:0482

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.