Vulmon
Amazon Linux AMI Security Advisory: ALAS-2021-1552
Advisory Release Date: 2021-12-01 08:34 Pacific
Advisory Updated Date: 2021-12-01 21:18 Pacific
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)
Affected Packages:
nss
Issue Correction:
Run yum update nss to update your system.
i686:
nss-sysinit-3.53.1-7.87.amzn1.i686
nss-devel-3.53.1-7.87.amzn1.i686
nss-pkcs11-devel-3.53.1-7.87.amzn1.i686
nss-tools-3.53.1-7.87.amzn1.i686
nss-debuginfo-3.53.1-7.87.amzn1.i686
nss-3.53.1-7.87.amzn1.i686
src:
nss-3.53.1-7.87.amzn1.src
x86_64:
nss-pkcs11-devel-3.53.1-7.87.amzn1.x86_64
nss-debuginfo-3.53.1-7.87.amzn1.x86_64
nss-tools-3.53.1-7.87.amzn1.x86_64
nss-devel-3.53.1-7.87.amzn1.x86_64
nss-sysinit-3.53.1-7.87.amzn1.x86_64
nss-3.53.1-7.87.amzn1.x86_64