Amazon Linux AMI update for gnupg2

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU64909

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

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:

i686:
    gnupg2-smime-2.0.28-2.35.amzn1.i686
    gnupg2-2.0.28-2.35.amzn1.i686
    gnupg2-debuginfo-2.0.28-2.35.amzn1.i686

src:
    gnupg2-2.0.28-2.35.amzn1.src

x86_64:
    gnupg2-smime-2.0.28-2.35.amzn1.x86_64
    gnupg2-2.0.28-2.35.amzn1.x86_64
    gnupg2-debuginfo-2.0.28-2.35.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

gnupg2: before 2.0.28-2.35

External links

http://alas.aws.amazon.com/ALAS-2022-1630.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.