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amazonAmazonALAS2-2021-1622
HistoryMar 25, 2021 - 6:31 p.m.

Important: openssl11

2021-03-2518:31:00
alas.aws.amazon.com
59

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

7.1 High

AI Score

Confidence

High

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.003 Low

EPSS

Percentile

70.6%

Issue Overview:

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. (CVE-2021-3449)

A flaw was found in openssl. The flag that enables additional security checks of certificates present in a certificate chain was not enabled allowing a confirmation step to verify that certificates in the chain are valid CA certificates is bypassed. The highest threat from this vulnerability is to data confidentiality and integrity. (CVE-2021-3450)

Affected Packages:

openssl11

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update openssl11 to update your system.

New Packages:

aarch64:  
    openssl11-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-libs-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-devel-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-static-1.1.1g-12.amzn2.0.3.aarch64  
    openssl11-debuginfo-1.1.1g-12.amzn2.0.3.aarch64  
  
i686:  
    openssl11-1.1.1g-12.amzn2.0.3.i686  
    openssl11-libs-1.1.1g-12.amzn2.0.3.i686  
    openssl11-devel-1.1.1g-12.amzn2.0.3.i686  
    openssl11-static-1.1.1g-12.amzn2.0.3.i686  
    openssl11-debuginfo-1.1.1g-12.amzn2.0.3.i686  
  
src:  
    openssl11-1.1.1g-12.amzn2.0.3.src  
  
x86_64:  
    openssl11-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-libs-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-devel-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-static-1.1.1g-12.amzn2.0.3.x86_64  
    openssl11-debuginfo-1.1.1g-12.amzn2.0.3.x86_64  

Additional References

Red Hat: CVE-2021-3449, CVE-2021-3450

Mitre: CVE-2021-3449, CVE-2021-3450

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

7.1 High

AI Score

Confidence

High

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.003 Low

EPSS

Percentile

70.6%