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Amazon Linux AMI : kernel (ALAS-2020-1377)
high Nessus Plugin ID 137100
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Synopsis
The remote Amazon Linux AMI host is missing a security update.Description
The version of kernel installed on the remote host is prior to 4.14.181-108.257. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2020-1377 advisory.In the Linux kernel 5.0.21, a setxattr operation, after a mount of a crafted ext4 image, can cause a slab- out-of-bounds write access because of an ext4_xattr_set_entry use-after-free in fs/ext4/xattr.c when a large old_size value is used in a memset call.(CVE-2019-19319)
In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the __blk_add_trace function in kernel/trace/blktrace.c (which is used to fill out a blk_io_trace structure and place it in a per-cpu sub- buffer).(CVE-2019-19768)
A flaw was found in the Linux kernels SELinux LSM hook implementation before version 5.7, where it incorrectly assumed that an skb would only contain a single netlink message. The hook would incorrectly only validate the first netlink message in the skb and allow or deny the rest of the messages within the skb with the granted permission without further processing.(CVE-2020-10751)
An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a certain failure case, aka CID-83c6f2390040.(CVE-2020-12770)
A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn't correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.(CVE-2020-1749)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Run 'yum update kernel' to update your system.See Also
https://access.redhat.com/security/cve/CVE-2019-19319
https://access.redhat.com/security/cve/CVE-2019-19768
https://access.redhat.com/security/cve/CVE-2020-10751
https://access.redhat.com/security/cve/CVE-2020-12770
Plugin Details
Severity: High
ID: 137100
File Name: ala_ALAS-2020-1377.nasl
Version: 1.5
Type: local
Agent: unix
Published: 6/4/2020
Updated: 12/11/2024
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.9
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS Score Source: CVE-2020-1749
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-headers, p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-debuginfo
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 6/3/2020
Vulnerability Publication Date: 11/27/2019
Reference Information
CVE: CVE-2019-19319, CVE-2019-19768, CVE-2020-10751, CVE-2020-12770, CVE-2020-1749
ALAS: 2020-1377