Debian update for xen



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-7540
CVE-2018-7541
CVE-2018-7542
CWE-ID CWE-400
CWE-119
CWE-476
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 Debian Linux
Operating systems & Components / Operating system

Vendor Debian

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU10780

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/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-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

Update the affected package to version: 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5

Vulnerable software versions

Debian Linux: All versions

CPE2.3 External links

https://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.

2) Memory corruption

EUVDB-ID: #VU10779

Risk: Low

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

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

Update the affected package to version: 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5

Vulnerable software versions

Debian Linux: All versions

CPE2.3 External links

https://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) NULL pointer dereference

EUVDB-ID: #VU12546

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

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 weakness exists due to NULL pointer dereference. An adjacent attacker can cause the service to crash by leveraging the mishandling of configurations that lack a Local APIC.

Mitigation

Update the affected package to version: 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5

Vulnerable software versions

Debian Linux: All versions

CPE2.3 External links

https://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.



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