Red Hat Enterprise Linux 8.2 update for openssl



Published: 2021-04-06
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-3449
CWE ID CWE-476
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Red Hat Enterprise Linux Server - TUS
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Advisory

This security advisory describes one medium risk vulnerability.

1) NULL pointer dereference

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-3449

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: Yes

Description

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

The vulnerability exists due to a NULL pointer dereference error when processing TLSv1.2 renegotiations. A remote attacker can send a maliciously crafted renegotiation ClientHello message, which omits the signature_algorithms extension but includes a signature_algorithms_cert extension, trigger a NULL pointer dereference error and crash the server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server - TUS: 8.2

openssl (Red Hat package): before 1.1.1c-18.el8_2

CPE External links

https://access.redhat.com/errata/RHSA-2021:1063

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.



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