Lucene search

K
amazonAmazonALAS2-2022-1769
HistoryApr 04, 2022 - 11:22 p.m.

Medium: libgcrypt

2022-04-0423:22:00
alas.aws.amazon.com
28
libgcrypt
elgamal encryption
side-channel attack
confidentiality
cve-2021-33560

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

7.7

Confidence

Low

EPSS

0.002

Percentile

61.1%

Issue Overview:

A side-channel attack flaw was found in the way libgcrypt implemented Elgamal encryption. This flaw allows an attacker to decrypt parts of ciphertext encrypted using Elgamal, for example, when using OpenPGP. The highest threat from this vulnerability is to confidentiality. (CVE-2021-33560)

Affected Packages:

libgcrypt

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 libgcrypt to update your system.

New Packages:

aarch64:  
    libgcrypt-1.5.3-14.amzn2.0.3.aarch64  
    libgcrypt-devel-1.5.3-14.amzn2.0.3.aarch64  
    libgcrypt-debuginfo-1.5.3-14.amzn2.0.3.aarch64  
  
i686:  
    libgcrypt-1.5.3-14.amzn2.0.3.i686  
    libgcrypt-devel-1.5.3-14.amzn2.0.3.i686  
    libgcrypt-debuginfo-1.5.3-14.amzn2.0.3.i686  
  
src:  
    libgcrypt-1.5.3-14.amzn2.0.3.src  
  
x86_64:  
    libgcrypt-1.5.3-14.amzn2.0.3.x86_64  
    libgcrypt-devel-1.5.3-14.amzn2.0.3.x86_64  
    libgcrypt-debuginfo-1.5.3-14.amzn2.0.3.x86_64  

Additional References

Red Hat: CVE-2021-33560

Mitre: CVE-2021-33560

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

7.7

Confidence

Low

EPSS

0.002

Percentile

61.1%