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amazonAmazonALAS2-2023-2209
HistoryAug 17, 2023 - 11:58 a.m.

Medium: amazon-cloudwatch-agent

2023-08-1711:58:00
alas.aws.amazon.com
10
amazon cloudwatch agent
update
restrict rsa key size
tls handshake security
cve-2023-29409
yum update

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

AI Score

6.7

Confidence

High

EPSS

0.001

Percentile

31.3%

Issue Overview:

2023-10-11: The severity level was changed from Important to Medium.

Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable. (CVE-2023-29409)

Affected Packages:

amazon-cloudwatch-agent

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 amazon-cloudwatch-agent to update your system.

New Packages:

aarch64:  
    amazon-cloudwatch-agent-1.300026.2-1.amzn2.aarch64  
  
src:  
    amazon-cloudwatch-agent-1.300026.2-1.amzn2.src  
  
x86_64:  
    amazon-cloudwatch-agent-1.300026.2-1.amzn2.x86_64  

Additional References

Red Hat: CVE-2023-29409

Mitre: CVE-2023-29409

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

AI Score

6.7

Confidence

High

EPSS

0.001

Percentile

31.3%