Denial of service in Xen



Published: 2018-02-27
Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-7542
CVE-2018-7541
CVE-2018-7540
CWE-ID CWE-476
CWE-119
CWE-400
Exploitation vector Local network
Public exploit N/A
Vulnerable software
Subscribe 		Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU10778

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7542

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to cause DoS condition on the target system.

The vulnerability exists due to a NULL pointer dereference in multiple paths without the presence of a Local APIC. An adjacent attacker can crash the hypervisor and cause a denial of service.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.8.0 - 4.8.3

External links

http://xenbits.xen.org/xsa/advisory-256.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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

2) Memory corruption

EUVDB-ID: #VU10779

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7541

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to cause DoS condition and gain elevated privileges on the target system.

The weakness exists due to an error when transitioning from v2 to v1. An adjacent attacker can trigger memory corruption, cause the service to crash and gain root privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.10.0

External links

http://xenbits.xen.org/xsa/advisory-255.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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

3) Resource exhaustion

EUVDB-ID: #VU10780

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7540

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows an adjacent authenticated attacker to cause a DoS condition on the target system.

The weakness exists due to non-preemptable L3/L4 pagetable freeing. An adjacent attacker can exhaust all available CPU resources and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.10.0

External links

http://xenbits.xen.org/xsa/advisory-252.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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



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