PT-2020-5260 · Qemu+2 · Qemu+2

Cornelius Aschermann + 2 · Published 2020-10-06 · Updated 2021-06-10 · CVE-2020-25742

Positive Technologies (AI Summary)

CVSS v3.1

3.2

Low

Base vector

AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions QEMU versions prior to 5.1.1

Description The issue is related to a NULL pointer dereference in the pci change irq level function in hw/pci/pci.c. This occurs because pci get bus() might not return a valid pointer, potentially allowing an attacker to cause a denial of service.

Recommendations For versions prior to 5.1.1, update to version 5.1.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the pci change irq level function in hw/pci/pci.c until a patch is available.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2020-3527

ALT-PU-2021-1880

ALT-PU-2021-1964

BDU:2020-05894

CVE-2020-25742

ECHO-F026-3251-8F2B

Affected Products

Alt Linux

Debian

Qemu

References · 15

• https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05294.html · Patch
• https://cve.org/CVERecord?id=CVE-2020-25742 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-25742 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-25742 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-25742 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-25742 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-25742 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-05894 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-25742 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1883178 · Patch
• https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Flsi_nullptr1 · Note
• https://suse.com/security/cve/CVE-2020-25742 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25742 · Note
• http://openwall.com/lists/oss-security/2020/09/29/1 · Note
• https://t.me/cibsecurity/15083 · Telegram Post