Lucene search

K
amazonAmazonALAS2-2023-1954
HistoryFeb 17, 2023 - 12:11 a.m.

Critical: nss-util

2023-02-1700:11:00
alas.aws.amazon.com
11

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

Issue Overview:

NSS (Network Security Services) up to and including 3.73 is vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS #7, or PKCS #12 are likely to be impacted. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how they configure NSS.
When verifying a DER-encoded signature, NSS decodes the signature into a fixed-size buffer and passes the buffer to the underlying PKCS #11 module. The length of the signature is not correctly checked when processing DSA and RSA-PSS signatures. DSA and RSA-PSS signatures larger than 16384 bits will overflow the buffer in VFYContextStr. The vulnerable code is located within secvfy.c:vfy_CreateContext. (CVE-2021-43527) (CVE-2021-43527)

Affected Packages:

nss-util

Issue Correction:
Run yum update nss-util to update your system.

New Packages:

aarch64:  
    nss-util-3.67.0-1.amzn2.0.1.aarch64  
    nss-util-devel-3.67.0-1.amzn2.0.1.aarch64  
    nss-util-debuginfo-3.67.0-1.amzn2.0.1.aarch64  
  
i686:  
    nss-util-3.67.0-1.amzn2.0.1.i686  
    nss-util-devel-3.67.0-1.amzn2.0.1.i686  
    nss-util-debuginfo-3.67.0-1.amzn2.0.1.i686  
  
src:  
    nss-util-3.67.0-1.amzn2.0.1.src  
  
x86_64:  
    nss-util-3.67.0-1.amzn2.0.1.x86_64  
    nss-util-devel-3.67.0-1.amzn2.0.1.x86_64  
    nss-util-debuginfo-3.67.0-1.amzn2.0.1.x86_64  

Additional References

Red Hat: CVE-2021-43527

Mitre: CVE-2021-43527

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

Related for ALAS2-2023-1954