Amazon Linux AMI update for gnupg2



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-34903
CWE-ID CWE-347
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

gnupg2
Operating systems & Components / Operating system package or component

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU64909

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-34903

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to an error in GnuPG, which allows signature spoofing via arbitrary injection into the status line. A remote attacker who controls the secret part of any signing-capable key or subkey in the victim's keyring, can take advantage of this flaw to provide a correctly-formed signature that some software, including gpgme, will accept to have validity and signer fingerprint chosen from the attacker.

Mitigation

Update the affected packages:

aarch64:
    gnupg2-minimal-debuginfo-2.3.7-1.amzn2023.0.3.aarch64
    gnupg2-smime-debuginfo-2.3.7-1.amzn2023.0.3.aarch64
    gnupg2-smime-2.3.7-1.amzn2023.0.3.aarch64
    gnupg2-minimal-2.3.7-1.amzn2023.0.3.aarch64
    gnupg2-debuginfo-2.3.7-1.amzn2023.0.3.aarch64
    gnupg2-2.3.7-1.amzn2023.0.3.aarch64
    gnupg2-debugsource-2.3.7-1.amzn2023.0.3.aarch64

src:
    gnupg2-2.3.7-1.amzn2023.0.3.src

x86_64:
    gnupg2-debuginfo-2.3.7-1.amzn2023.0.3.x86_64
    gnupg2-smime-debuginfo-2.3.7-1.amzn2023.0.3.x86_64
    gnupg2-minimal-2.3.7-1.amzn2023.0.3.x86_64
    gnupg2-minimal-debuginfo-2.3.7-1.amzn2023.0.3.x86_64
    gnupg2-smime-2.3.7-1.amzn2023.0.3.x86_64
    gnupg2-debugsource-2.3.7-1.amzn2023.0.3.x86_64
    gnupg2-2.3.7-1.amzn2023.0.3.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

gnupg2: before 2.3.7-1

CPE2.3 External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-087.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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