Medium: expat

Issue Overview:

It was discovered that the “setElementTypePrefix()” function incorrectly extracted XML namespace prefixes. By tricking an application into processing a specially crafted XML file, an attacker could cause unusually high consumption of memory resources and possibly lead to a denial of service. (CVE-2018-20843)

In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read. (CVE-2019-15903)

Affected Packages:

expat

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 expat to update your system.

New Packages:

aarch64:  
    expat-2.1.0-12.amzn2.aarch64  
    expat-devel-2.1.0-12.amzn2.aarch64  
    expat-static-2.1.0-12.amzn2.aarch64  
    expat-debuginfo-2.1.0-12.amzn2.aarch64  
  
i686:  
    expat-2.1.0-12.amzn2.i686  
    expat-devel-2.1.0-12.amzn2.i686  
    expat-static-2.1.0-12.amzn2.i686  
    expat-debuginfo-2.1.0-12.amzn2.i686  
  
src:  
    expat-2.1.0-12.amzn2.src  
  
x86_64:  
    expat-2.1.0-12.amzn2.x86_64  
    expat-devel-2.1.0-12.amzn2.x86_64  
    expat-static-2.1.0-12.amzn2.x86_64  
    expat-debuginfo-2.1.0-12.amzn2.x86_64  

Additional References

Red Hat: CVE-2018-20843, CVE-2019-15903

Mitre: CVE-2018-20843, CVE-2019-15903