Medium: libxslt

Issue Overview:

libxslt through 1.1.33 allows bypass of a protection mechanism because callers of xsltCheckRead and xsltCheckWrite permit access even upon receiving a -1 error code. xsltCheckRead can return -1 for a crafted URL that is not actually invalid and is subsequently loaded. (CVE-2019-11068)

In xsltCopyText in transform.c in libxslt 1.1.33, a pointer variable isn’t reset under certain circumstances. If the relevant memory area happened to be freed and reused in a certain way, a bounds check could fail and memory outside a buffer could be written to, or uninitialized data could be disclosed. (CVE-2019-18197)

Affected Packages:

libxslt

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 libxslt to update your system.

New Packages:

aarch64:  
    libxslt-1.1.28-6.amzn2.aarch64  
    libxslt-devel-1.1.28-6.amzn2.aarch64  
    libxslt-python-1.1.28-6.amzn2.aarch64  
    libxslt-debuginfo-1.1.28-6.amzn2.aarch64  
  
i686:  
    libxslt-1.1.28-6.amzn2.i686  
    libxslt-devel-1.1.28-6.amzn2.i686  
    libxslt-python-1.1.28-6.amzn2.i686  
    libxslt-debuginfo-1.1.28-6.amzn2.i686  
  
src:  
    libxslt-1.1.28-6.amzn2.src  
  
x86_64:  
    libxslt-1.1.28-6.amzn2.x86_64  
    libxslt-devel-1.1.28-6.amzn2.x86_64  
    libxslt-python-1.1.28-6.amzn2.x86_64  
    libxslt-debuginfo-1.1.28-6.amzn2.x86_64  

Additional References

Red Hat: CVE-2019-11068, CVE-2019-18197

Mitre: CVE-2019-11068, CVE-2019-18197