Ubuntu update for QEMU

1) Use-after-free

EUVDB-ID: #VU20964

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-15890

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists in "ip_reass()" routine in "ip_input.c" file while reassembling incoming packets, if the first fragment is bigger than the m->m_dat[] buffer. A remote attacker can send a specially crafted packet and cause the application to crash.

Mitigation

Update the affected packages.

Ubuntu 19.10: qemu - 1:4.0+dfsg-0ubuntu9.1; qemu-kvm - 1:4.0+dfsg-0ubuntu9.1; qemu-system-common - 1:4.0+dfsg-0ubuntu9.1; qemu-system-gui - 1:4.0+dfsg-0ubuntu9.1; qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.1; qemu-user-static - 1:4.0+dfsg-0ubuntu9.1; qemu-utils - 1:4.0+dfsg-0ubuntu9.1
Ubuntu 19.04: qemu - 1:3.1+dfsg-2ubuntu3.6; qemu-kvm - 1:3.1+dfsg-2ubuntu3.6; qemu-system-common - 1:3.1+dfsg-2ubuntu3.6; qemu-system-gui - 1:3.1+dfsg-2ubuntu3.6; qemu-system-x86 - 1:3.1+dfsg-2ubuntu3.6; qemu-user-static - 1:3.1+dfsg-2ubuntu3.6; qemu-utils - 1:3.1+dfsg-2ubuntu3.6
Ubuntu 18.04 LTS: qemu - 1:2.11+dfsg-1ubuntu7.20; qemu-kvm - 1:2.11+dfsg-1ubuntu7.20; qemu-system-common - 1:2.11+dfsg-1ubuntu7.20; qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.20; qemu-user-static - 1:2.11+dfsg-1ubuntu7.20; qemu-utils - 1:2.11+dfsg-1ubuntu7.20
Ubuntu 16.04 LTS: qemu - 1:2.5+dfsg-5ubuntu10.42; qemu-kvm - 1:2.5+dfsg-5ubuntu10.42; qemu-system-common - 1:2.5+dfsg-5ubuntu10.42; qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.42; qemu-user-static - 1:2.5+dfsg-5ubuntu10.42; qemu-utils - 1:2.5+dfsg-5ubuntu10.42

Vulnerable software versions

qemu (Ubuntu package): 1:2.5+dfsg-5ubuntu10.1 - 1:3.1+dfsg-2ubuntu3.5

CPE2.3

External links

https://usn.ubuntu.com/4191-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Heap-based buffer overflow

EUVDB-ID: #VU20446

Risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-14378

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the ip_reass() function in ip_input.c in libslirp. A remote authenticated attacker can send a large packet, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected packages.

Ubuntu 19.10: qemu - 1:4.0+dfsg-0ubuntu9.1; qemu-kvm - 1:4.0+dfsg-0ubuntu9.1; qemu-system-common - 1:4.0+dfsg-0ubuntu9.1; qemu-system-gui - 1:4.0+dfsg-0ubuntu9.1; qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.1; qemu-user-static - 1:4.0+dfsg-0ubuntu9.1; qemu-utils - 1:4.0+dfsg-0ubuntu9.1
Ubuntu 19.04: qemu - 1:3.1+dfsg-2ubuntu3.6; qemu-kvm - 1:3.1+dfsg-2ubuntu3.6; qemu-system-common - 1:3.1+dfsg-2ubuntu3.6; qemu-system-gui - 1:3.1+dfsg-2ubuntu3.6; qemu-system-x86 - 1:3.1+dfsg-2ubuntu3.6; qemu-user-static - 1:3.1+dfsg-2ubuntu3.6; qemu-utils - 1:3.1+dfsg-2ubuntu3.6
Ubuntu 18.04 LTS: qemu - 1:2.11+dfsg-1ubuntu7.20; qemu-kvm - 1:2.11+dfsg-1ubuntu7.20; qemu-system-common - 1:2.11+dfsg-1ubuntu7.20; qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.20; qemu-user-static - 1:2.11+dfsg-1ubuntu7.20; qemu-utils - 1:2.11+dfsg-1ubuntu7.20
Ubuntu 16.04 LTS: qemu - 1:2.5+dfsg-5ubuntu10.42; qemu-kvm - 1:2.5+dfsg-5ubuntu10.42; qemu-system-common - 1:2.5+dfsg-5ubuntu10.42; qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.42; qemu-user-static - 1:2.5+dfsg-5ubuntu10.42; qemu-utils - 1:2.5+dfsg-5ubuntu10.42

Vulnerable software versions

qemu (Ubuntu package): 1:2.5+dfsg-5ubuntu10.1 - 1:3.1+dfsg-2ubuntu3.5

CPE2.3

External links

https://usn.ubuntu.com/4191-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Improper access control

EUVDB-ID: #VU19054

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-13164

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local attacker to gain unauthorized access to sensitive information.

The vulnerability exists due to qemu-bridge-helper.c does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option) is limited to the IFNAMSIZ size. A local attacker can create a tap device and attach it to a denied bridge interface, bypass the Access Control List (ACL) and get access to confidential data transmitted on the bridge.

Mitigation

Update the affected packages.

Ubuntu 19.10: qemu - 1:4.0+dfsg-0ubuntu9.1; qemu-kvm - 1:4.0+dfsg-0ubuntu9.1; qemu-system-common - 1:4.0+dfsg-0ubuntu9.1; qemu-system-gui - 1:4.0+dfsg-0ubuntu9.1; qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.1; qemu-user-static - 1:4.0+dfsg-0ubuntu9.1; qemu-utils - 1:4.0+dfsg-0ubuntu9.1
Ubuntu 19.04: qemu - 1:3.1+dfsg-2ubuntu3.6; qemu-kvm - 1:3.1+dfsg-2ubuntu3.6; qemu-system-common - 1:3.1+dfsg-2ubuntu3.6; qemu-system-gui - 1:3.1+dfsg-2ubuntu3.6; qemu-system-x86 - 1:3.1+dfsg-2ubuntu3.6; qemu-user-static - 1:3.1+dfsg-2ubuntu3.6; qemu-utils - 1:3.1+dfsg-2ubuntu3.6
Ubuntu 18.04 LTS: qemu - 1:2.11+dfsg-1ubuntu7.20; qemu-kvm - 1:2.11+dfsg-1ubuntu7.20; qemu-system-common - 1:2.11+dfsg-1ubuntu7.20; qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.20; qemu-user-static - 1:2.11+dfsg-1ubuntu7.20; qemu-utils - 1:2.11+dfsg-1ubuntu7.20
Ubuntu 16.04 LTS: qemu - 1:2.5+dfsg-5ubuntu10.42; qemu-kvm - 1:2.5+dfsg-5ubuntu10.42; qemu-system-common - 1:2.5+dfsg-5ubuntu10.42; qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.42; qemu-user-static - 1:2.5+dfsg-5ubuntu10.42; qemu-utils - 1:2.5+dfsg-5ubuntu10.42

Vulnerable software versions

qemu (Ubuntu package): 1:2.5+dfsg-5ubuntu10.1 - 1:3.1+dfsg-2ubuntu3.5

CPE2.3

External links

https://usn.ubuntu.com/4191-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) NULL pointer dereference

EUVDB-ID: #VU20499

Risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-12155

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in "hw/display/qxl.c". A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Update the affected packages.

Ubuntu 19.10: qemu - 1:4.0+dfsg-0ubuntu9.1; qemu-kvm - 1:4.0+dfsg-0ubuntu9.1; qemu-system-common - 1:4.0+dfsg-0ubuntu9.1; qemu-system-gui - 1:4.0+dfsg-0ubuntu9.1; qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.1; qemu-user-static - 1:4.0+dfsg-0ubuntu9.1; qemu-utils - 1:4.0+dfsg-0ubuntu9.1
Ubuntu 19.04: qemu - 1:3.1+dfsg-2ubuntu3.6; qemu-kvm - 1:3.1+dfsg-2ubuntu3.6; qemu-system-common - 1:3.1+dfsg-2ubuntu3.6; qemu-system-gui - 1:3.1+dfsg-2ubuntu3.6; qemu-system-x86 - 1:3.1+dfsg-2ubuntu3.6; qemu-user-static - 1:3.1+dfsg-2ubuntu3.6; qemu-utils - 1:3.1+dfsg-2ubuntu3.6
Ubuntu 18.04 LTS: qemu - 1:2.11+dfsg-1ubuntu7.20; qemu-kvm - 1:2.11+dfsg-1ubuntu7.20; qemu-system-common - 1:2.11+dfsg-1ubuntu7.20; qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.20; qemu-user-static - 1:2.11+dfsg-1ubuntu7.20; qemu-utils - 1:2.11+dfsg-1ubuntu7.20
Ubuntu 16.04 LTS: qemu - 1:2.5+dfsg-5ubuntu10.42; qemu-kvm - 1:2.5+dfsg-5ubuntu10.42; qemu-system-common - 1:2.5+dfsg-5ubuntu10.42; qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.42; qemu-user-static - 1:2.5+dfsg-5ubuntu10.42; qemu-utils - 1:2.5+dfsg-5ubuntu10.42

Vulnerable software versions

qemu (Ubuntu package): 1:2.5+dfsg-5ubuntu10.1 - 1:3.1+dfsg-2ubuntu3.5

CPE2.3

External links

https://usn.ubuntu.com/4191-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Infinite loop

EUVDB-ID: #VU22783

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-12068

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in lsi_execute_script() when reading empty opcode. A local user can consume all available system resources and cause denial of service conditions.

Mitigation

Update the affected packages.

Ubuntu 19.10: qemu - 1:4.0+dfsg-0ubuntu9.1; qemu-kvm - 1:4.0+dfsg-0ubuntu9.1; qemu-system-common - 1:4.0+dfsg-0ubuntu9.1; qemu-system-gui - 1:4.0+dfsg-0ubuntu9.1; qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.1; qemu-user-static - 1:4.0+dfsg-0ubuntu9.1; qemu-utils - 1:4.0+dfsg-0ubuntu9.1
Ubuntu 19.04: qemu - 1:3.1+dfsg-2ubuntu3.6; qemu-kvm - 1:3.1+dfsg-2ubuntu3.6; qemu-system-common - 1:3.1+dfsg-2ubuntu3.6; qemu-system-gui - 1:3.1+dfsg-2ubuntu3.6; qemu-system-x86 - 1:3.1+dfsg-2ubuntu3.6; qemu-user-static - 1:3.1+dfsg-2ubuntu3.6; qemu-utils - 1:3.1+dfsg-2ubuntu3.6
Ubuntu 18.04 LTS: qemu - 1:2.11+dfsg-1ubuntu7.20; qemu-kvm - 1:2.11+dfsg-1ubuntu7.20; qemu-system-common - 1:2.11+dfsg-1ubuntu7.20; qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.20; qemu-user-static - 1:2.11+dfsg-1ubuntu7.20; qemu-utils - 1:2.11+dfsg-1ubuntu7.20
Ubuntu 16.04 LTS: qemu - 1:2.5+dfsg-5ubuntu10.42; qemu-kvm - 1:2.5+dfsg-5ubuntu10.42; qemu-system-common - 1:2.5+dfsg-5ubuntu10.42; qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.42; qemu-user-static - 1:2.5+dfsg-5ubuntu10.42; qemu-utils - 1:2.5+dfsg-5ubuntu10.42

Vulnerable software versions

qemu (Ubuntu package): 1:2.5+dfsg-5ubuntu10.1 - 1:3.1+dfsg-2ubuntu3.5

CPE2.3

External links

https://usn.ubuntu.com/4191-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	Medium
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2019-15890 CVE-2019-14378 CVE-2019-13164 CVE-2019-12155 CVE-2019-12068
CWE-ID	CWE-416 CWE-122 CWE-284 CWE-476 CWE-835
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	qemu (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.