Amazon Linux AMI update for gnutls



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-5981
CWE-ID CWE-208
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

gnutls
Operating systems & Components / Operating system package or component

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Information Exposure Through Timing Discrepancy

EUVDB-ID: #VU83316

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-5981

CWE-ID: CWE-208 - Information Exposure Through Timing Discrepancy

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform timing attack.

The vulnerability exists due to the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding. A remote attacker can perform timing sidechannel attack in RSA-PSK key exchange.

Mitigation

Update the affected packages:

aarch64:
    gnutls-dane-debuginfo-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-utils-debuginfo-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-c++-debuginfo-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-debuginfo-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-debugsource-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-utils-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-dane-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-c++-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-3.8.0-377.amzn2023.0.3.aarch64
    gnutls-devel-3.8.0-377.amzn2023.0.3.aarch64

src:
    gnutls-3.8.0-377.amzn2023.0.3.src

x86_64:
    gnutls-c++-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-debuginfo-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-dane-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-dane-debuginfo-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-utils-debuginfo-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-c++-debuginfo-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-utils-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-debugsource-3.8.0-377.amzn2023.0.3.x86_64
    gnutls-devel-3.8.0-377.amzn2023.0.3.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

gnutls: before 3.8.0-377

CPE2.3 External links

https://alas.aws.amazon.com/AL2023/ALAS-2024-463.html


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.



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