Medium: edk2

Issue Overview:

Issue summary: Checking excessively long DH keys or parameters may be very slow.

Impact summary: Applications that use the functions DH_check(), DH_check_ex()
or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long
delays. Where the key or parameters that are being checked have been obtained
from an untrusted source this may lead to a Denial of Service.

The function DH_check() performs various checks on DH parameters. After fixing
CVE-2023-3446 it was discovered that a large q parameter value can also trigger
an overly long computation during some of these checks. A correct q value,
if present, cannot be larger than the modulus p parameter, thus it is
unnecessary to perform these checks if q is larger than p.

An application that calls DH_check() and supplies a key or parameters obtained
from an untrusted source could be vulnerable to a Denial of Service attack.

The function DH_check() is itself called by a number of other OpenSSL functions.
An application calling any of those other functions may similarly be affected.
The other functions affected by this are DH_check_ex() and
EVP_PKEY_param_check().

Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications
when using the “-check” option.

The OpenSSL SSL/TLS implementation is not affected by this issue.

The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue. (CVE-2023-3817)

Affected Packages:

edk2

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 edk2 to update your system.

New Packages:

aarch64:  
    edk2-tools-20200801stable-1.amzn2.0.2.aarch64  
    edk2-debuginfo-20200801stable-1.amzn2.0.2.aarch64  
  
noarch:  
    edk2-tools-python-20200801stable-1.amzn2.0.2.noarch  
    edk2-tools-doc-20200801stable-1.amzn2.0.2.noarch  
    edk2-ovmf-20200801stable-1.amzn2.0.2.noarch  
    edk2-aarch64-20200801stable-1.amzn2.0.2.noarch  
  
src:  
    edk2-20200801stable-1.amzn2.0.2.src  
  
x86_64:  
    edk2-tools-20200801stable-1.amzn2.0.2.x86_64  
    edk2-debuginfo-20200801stable-1.amzn2.0.2.x86_64  

Additional References

Red Hat: CVE-2023-3817

Mitre: CVE-2023-3817