Amazon Linux AMI update for kernel



| Updated: 2018-05-30
Risk Low
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2018-1087
CVE-2018-1000199
CVE-2017-16939
CVE-2018-1068
CVE-2018-1108
CVE-2018-8897
CVE-2018-1091
CWE-ID CWE-703
CWE-388
CWE-416
CWE-264
CWE-665
Exploitation vector Network
Public exploit Public exploit code for vulnerability #3 is available.
Vulnerability #6 is being exploited in the wild.
Vulnerable software
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Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Improper check or handling of exceptional conditions

EUVDB-ID: #VU12520

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-2018-1087

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

Exploit availability: No

Description

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

The weakness exists in the Linux kernel KVM hypervisor due to improper handling of debug exceptions delivered after a stack switch operation via mov SS or pop SS instructions. During the stack switch operation, the exceptions are deferred. An adjacent attacker can cause the service to crash or gain root privileges.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.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) Error handling

EUVDB-ID: #VU12337

Risk: Low

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

CVE-ID: CVE-2018-1000199

CWE-ID: CWE-388 - Error Handling

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the modify_user_hw_breakpoint() function due to error handling flaw. A local attacker can cause the service to crash.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.html


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.

3) Use-after-free error

EUVDB-ID: #VU9601

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-16939

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the XFRM dump policy implementation in net/xfrm/xfrm_user.c in the Linux kernel due to use-after-free error. A local attacker can make a specially crafted SO_RCVBUF setsockopt system call in conjunction with XFRM_MSG_GETPOLICY Netlink messages, trigger memory corruption and cause the service to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.html


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. However, proof of concept for this vulnerability is available.

4) Privilege escalation

EUVDB-ID: #VU11145

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1068

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to an error in the implementation of 32 bit syscall interface. A local attacker can gain root privileges.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.html


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.

5) Improper initialization

EUVDB-ID: #VU12179

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1108

CWE-ID: CWE-665 - Improper Initialization

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the crng_ready() function due to improper initialization. A remote attacker can cause the service to crash.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.html


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.

6) Privilege escalation

EUVDB-ID: #VU12450

Risk: Low

CVSSv3.1: 8.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-8897

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

Exploit availability: Yes

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to improper implementation of Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) on multiple system kernels, which results in an unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS. A local user can execute arbitrary code with elevated privileges.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.html


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?

Yes. This vulnerability is being exploited in the wild.

7) Denial of service

EUVDB-ID: #VU11327

Risk: Low

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

CVE-ID: CVE-2018-1091

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the flush_tmregs_to_thread function, as defined in the arch/powerpc/kernel/ptrace.c source code, due to a missing processor feature check and an erroneous use of transactional memory (TM) instructions in the core dump path. A local attacker can use unprivileged userspace during a core dump on a POWER host and cause the service to crash.

Mitigation

Update the affected packages.

i686:
    kernel-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.42-52.37.amzn1.i686
    kernel-headers-4.14.42-52.37.amzn1.i686
    perf-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-tools-4.14.42-52.37.amzn1.i686
    perf-4.14.42-52.37.amzn1.i686
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-debuginfo-4.14.42-52.37.amzn1.i686
    kernel-devel-4.14.42-52.37.amzn1.i686
    kernel-tools-devel-4.14.42-52.37.amzn1.i686

src:
    kernel-4.14.42-52.37.amzn1.src

x86_64:
    kernel-tools-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.42-52.37.amzn1.x86_64
    kernel-4.14.42-52.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-tools-devel-4.14.42-52.37.amzn1.x86_64
    kernel-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-devel-4.14.42-52.37.amzn1.x86_64
    perf-4.14.42-52.37.amzn1.x86_64
    perf-debuginfo-4.14.42-52.37.amzn1.x86_64
    kernel-headers-4.14.42-52.37.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

http://alas.aws.amazon.com/ALAS-2018-1023.html


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.



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