Amazon Linux AMI update for kernel



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-8912
CWE-ID CWE-416
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Amazon Linux AMI
Operating systems & Components / Operating system

Vendor Amazon Web Services

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU17804

Risk: Low

CVSSv4.0: 5.4 [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:P/U:Clear]

CVE-ID: CVE-2019-8912

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to the af_alg_release() function, as defined in the crypto/af_alg.c source code file of the affected software, fails to set a NULL value for a certain structure member. A local attacker can access the system and execute an application that submits malicious input to the affected software and trigger a use-after-free condition in the sockfs_setattr function, resulting in a DoS condition

Mitigation

Update the affected packages:

i686:
    kernel-debuginfo-common-i686-4.14.104-78.84.amzn1.i686
    kernel-tools-devel-4.14.104-78.84.amzn1.i686
    kernel-devel-4.14.104-78.84.amzn1.i686
    perf-4.14.104-78.84.amzn1.i686
    kernel-4.14.104-78.84.amzn1.i686
    kernel-headers-4.14.104-78.84.amzn1.i686
    perf-debuginfo-4.14.104-78.84.amzn1.i686
    kernel-tools-debuginfo-4.14.104-78.84.amzn1.i686
    kernel-debuginfo-4.14.104-78.84.amzn1.i686
    kernel-tools-4.14.104-78.84.amzn1.i686

src:
    kernel-4.14.104-78.84.amzn1.src

x86_64:
    perf-debuginfo-4.14.104-78.84.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.104-78.84.amzn1.x86_64
    kernel-headers-4.14.104-78.84.amzn1.x86_64
    kernel-devel-4.14.104-78.84.amzn1.x86_64
    kernel-tools-debuginfo-4.14.104-78.84.amzn1.x86_64
    perf-4.14.104-78.84.amzn1.x86_64
    kernel-debuginfo-4.14.104-78.84.amzn1.x86_64
    kernel-4.14.104-78.84.amzn1.x86_64
    kernel-tools-4.14.104-78.84.amzn1.x86_64
    kernel-tools-devel-4.14.104-78.84.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3 External links

https://alas.aws.amazon.com/ALAS-2019-1167.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.



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