CVE-2019-6778 Memory corruption in n/a

High 7.8 Published 17 Mar 2019 Updated 4 Aug 2024

A heap-based buffer overflow in QEMU's SLIRP TCP emulation allows attackers to execute arbitrary code or escalate privileges.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2019-6778?

CVE-2019-6778 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 17 Mar 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a heap-based buffer overflow.

Weakness: CWE-787

Which versions are affected by CVE-2019-6778?

It affects 4 products.

Linux distribution packages (21)

`qemu-img` Red Hat:enterprise_linux:7::client	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm` Red Hat:enterprise_linux:7::client	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-common` Red Hat:enterprise_linux:7::client	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-tools` Red Hat:enterprise_linux:7::client	All versions	`10:1.5.3-160.el7_6.3`
`qemu-img` Red Hat:enterprise_linux:7::computenode	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm` Red Hat:enterprise_linux:7::computenode	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-common` Red Hat:enterprise_linux:7::computenode	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-debuginfo` Red Hat:enterprise_linux:7::computenode	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-tools` Red Hat:enterprise_linux:7::computenode	All versions	`10:1.5.3-160.el7_6.3`
`qemu-img` Red Hat:enterprise_linux:7::server	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm` Red Hat:enterprise_linux:7::server	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-common` Red Hat:enterprise_linux:7::server	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-tools` Red Hat:enterprise_linux:7::server	All versions	`10:1.5.3-160.el7_6.3`
`qemu-img` Red Hat:enterprise_linux:7::workstation	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm` Red Hat:enterprise_linux:7::workstation	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-common` Red Hat:enterprise_linux:7::workstation	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`10:1.5.3-160.el7_6.3`
`qemu-kvm-tools` Red Hat:enterprise_linux:7::workstation	All versions	`10:1.5.3-160.el7_6.3`
`slirp4netns` openSUSE:Tumbleweed	All versions	`1.1.11-1.2`

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Opensuse Leap, Qemu Qemu.

How do I fix CVE-2019-6778?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-6778 being exploited?

There is no known exploitation of CVE-2019-6778 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2019-6778, GHSA-4wxm-q46g-3mcf, RHSA-2019:1883, UBUNTU-CVE-2019-6778, openSUSE-SU-2024:11387-1.