Access of Uninitialized Pointer Affecting virt:rhel/lua-guestfs package, versions <1:1.40.2-28.module+el8.5.0+10717+67be7ac4


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (19th percentile)

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  • Snyk IDSNYK-RHEL8-VIRT-4130537
  • published26 Jul 2021
  • disclosed14 Jun 2021

Introduced: 14 Jun 2021

CVE-2021-3593  (opens in a new tab)
CWE-824  (opens in a new tab)

How to fix?

Upgrade RHEL:8 virt:rhel/lua-guestfs to version 1:1.40.2-28.module+el8.5.0+10717+67be7ac4 or higher.
This issue was patched in RHSA-2021:4191.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt:rhel/lua-guestfs package and not the virt:rhel/lua-guestfs package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

CVSS Scores

version 3.1