Amazon Linux AMI Security Advisory: ALAS-2021-1463
Advisory Release Date: 2021-01-12 22:51 Pacific
Advisory Updated Date: 2021-01-13 18:16 Pacific
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 )
Run yum update libxslt to update your system.