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redhatcveRedhat.comRH:CVE-2021-3449
HistoryMar 25, 2021 - 2:58 p.m.

CVE-2021-3449

2021-03-2514:58:10
redhat.com
access.redhat.com
39
openssl
server crash
tlsv1.2
denial of service
signature_algorithms_cert
system availability
mitigation
httpd package
red hat enterprise linux 8

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.005

Percentile

76.4%

JSON

A flaw was found in openssl. A server crash and denial of service attack could occur if a client sends a TLSv1.2 renegotiation ClientHello and omits the signature_algorithms extension but includes a signature_algorithms_cert extension. The highest threat from this vulnerability is to system availability.

Mitigation

This flaw can be mitigated by disabling TLS renegotiation on servers compiled with OpenSSL. It is enabled by default, but can be disabled for servers which do not require it and can be used to mitigate this flaw. Versions of httpd package shipped with Red Hat Enterprise Linux 8 have TLS renegotiation disabled by default.

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CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.005

Percentile

76.4%

JSON
Related for RH:CVE-2021-3449
ibm37openvas32redhat14cvelist1cve1alpinelinux1nvd1openssl1osv9f51nessus54suse5ubuntu2debiancve1debian3seebug1ubuntucve1mscve1githubexploit2rustsec1cloudfoundry1ics1veracode1prion1github1checkpoint_security1oraclelinux2altlinux2attackerkb2thn1mageia1archlinux1freebsd2amazon1cisco1fedora1almalinux1symantec1rocky1photon3freebsd_advisory1nodejsblog1gentoo1kaspersky1