Debian 9 Stretch: DLA-2972-1 Moderate Libxml2 DoS and XXE Issues

debian lts

April 8, 2022

Five security issues have been discovered in libxml2: XML C parser and toolkit

Topics Covered

security advisory moderate security issue Debian DoS libxml2 XXE

Summary

CVE-2016-9318

Vulnerable versions do not offer a flag directly indicating that the current
document may be read but other files may not be opened, which makes it
easier for remote attackers to conduct XML External Entity (XXE) attacks via
a crafted document.

CVE-2017-5130

Integer overflow in memory debug code, allowed a remote attacker to
potentially exploit heap corruption via a crafted XML file.

CVE-2017-5969

Parser in a recover mode allows remote attackers to cause a denial of service
(NULL pointer dereference) via a crafted XML document.

CVE-2017-16932

When expanding a parameter entity in a DTD, infinite recursion could lead to
an infinite loop or memory exhaustion.

CVE-2022-23308

the application that validates XML using xmlTextReaderRead() with
XML_PARSE_DTDATTR and XML_PARSE_DTDVALID enabled becomes vulnerable to this
use-after-free bug. This issue can result in denial of service.

For Debian 9 stretch, these problems have been fixed in version