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
Issue Correction:
Run yum update nss to update your system.
New Packages:
aarch64:
nss-3.67.0-4.amzn2.0.2.aarch64
nss-tools-3.67.0-4.amzn2.0.2.aarch64
nss-sysinit-3.67.0-4.amzn2.0.2.aarch64
nss-devel-3.67.0-4.amzn2.0.2.aarch64
nss-pkcs11-devel-3.67.0-4.amzn2.0.2.aarch64
nss-debuginfo-3.67.0-4.amzn2.0.2.aarch64
i686:
nss-3.67.0-4.amzn2.0.2.i686
nss-tools-3.67.0-4.amzn2.0.2.i686
nss-sysinit-3.67.0-4.amzn2.0.2.i686
nss-devel-3.67.0-4.amzn2.0.2.i686
nss-pkcs11-devel-3.67.0-4.amzn2.0.2.i686
nss-debuginfo-3.67.0-4.amzn2.0.2.i686
src:
nss-3.67.0-4.amzn2.0.2.src
x86_64:
nss-3.67.0-4.amzn2.0.2.x86_64
nss-tools-3.67.0-4.amzn2.0.2.x86_64
nss-sysinit-3.67.0-4.amzn2.0.2.x86_64
nss-devel-3.67.0-4.amzn2.0.2.x86_64
nss-pkcs11-devel-3.67.0-4.amzn2.0.2.x86_64
nss-debuginfo-3.67.0-4.amzn2.0.2.x86_64
Red Hat: CVE-2021-43527
Mitre: CVE-2021-43527
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | nss | < 3.67.0-4.amzn2.0.2 | nss-3.67.0-4.amzn2.0.2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | nss-tools | < 3.67.0-4.amzn2.0.2 | nss-tools-3.67.0-4.amzn2.0.2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | nss-sysinit | < 3.67.0-4.amzn2.0.2 | nss-sysinit-3.67.0-4.amzn2.0.2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | nss-devel | < 3.67.0-4.amzn2.0.2 | nss-devel-3.67.0-4.amzn2.0.2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | nss-pkcs11-devel | < 3.67.0-4.amzn2.0.2 | nss-pkcs11-devel-3.67.0-4.amzn2.0.2.aarch64.rpm |
Amazon Linux | 2 | aarch64 | nss-debuginfo | < 3.67.0-4.amzn2.0.2 | nss-debuginfo-3.67.0-4.amzn2.0.2.aarch64.rpm |
Amazon Linux | 2 | i686 | nss | < 3.67.0-4.amzn2.0.2 | nss-3.67.0-4.amzn2.0.2.i686.rpm |
Amazon Linux | 2 | i686 | nss-tools | < 3.67.0-4.amzn2.0.2 | nss-tools-3.67.0-4.amzn2.0.2.i686.rpm |
Amazon Linux | 2 | i686 | nss-sysinit | < 3.67.0-4.amzn2.0.2 | nss-sysinit-3.67.0-4.amzn2.0.2.i686.rpm |
Amazon Linux | 2 | i686 | nss-devel | < 3.67.0-4.amzn2.0.2 | nss-devel-3.67.0-4.amzn2.0.2.i686.rpm |
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