ALAS2-2020-1425

Amazon Linux 2 Security Advisory: ALAS-2020-1425
Advisory Release Date: 2020-05-11 20:37 Pacific
Advisory Updated Date: 2020-05-12 21:45 Pacific
Severity: Important
Issue Overview:

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service. (CVE-2020-10711)


Affected Packages:

kernel


Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.


Issue Correction:
Run yum update kernel to update your system.

New Packages:
aarch64:
    kernel-4.14.177-139.254.amzn2.aarch64
    kernel-headers-4.14.177-139.254.amzn2.aarch64
    kernel-debuginfo-common-aarch64-4.14.177-139.254.amzn2.aarch64
    perf-4.14.177-139.254.amzn2.aarch64
    perf-debuginfo-4.14.177-139.254.amzn2.aarch64
    python-perf-4.14.177-139.254.amzn2.aarch64
    python-perf-debuginfo-4.14.177-139.254.amzn2.aarch64
    kernel-tools-4.14.177-139.254.amzn2.aarch64
    kernel-tools-devel-4.14.177-139.254.amzn2.aarch64
    kernel-tools-debuginfo-4.14.177-139.254.amzn2.aarch64
    kernel-devel-4.14.177-139.254.amzn2.aarch64
    kernel-debuginfo-4.14.177-139.254.amzn2.aarch64

i686:
    kernel-headers-4.14.177-139.254.amzn2.i686

src:
    kernel-4.14.177-139.254.amzn2.src

x86_64:
    kernel-4.14.177-139.254.amzn2.x86_64
    kernel-headers-4.14.177-139.254.amzn2.x86_64
    kernel-debuginfo-common-x86_64-4.14.177-139.254.amzn2.x86_64
    perf-4.14.177-139.254.amzn2.x86_64
    perf-debuginfo-4.14.177-139.254.amzn2.x86_64
    python-perf-4.14.177-139.254.amzn2.x86_64
    python-perf-debuginfo-4.14.177-139.254.amzn2.x86_64
    kernel-tools-4.14.177-139.254.amzn2.x86_64
    kernel-tools-devel-4.14.177-139.254.amzn2.x86_64
    kernel-tools-debuginfo-4.14.177-139.254.amzn2.x86_64
    kernel-devel-4.14.177-139.254.amzn2.x86_64
    kernel-debuginfo-4.14.177-139.254.amzn2.x86_64
    kernel-livepatch-4.14.177-139.254-1.0-0.amzn2.x86_64

Additional References

Red Hat: CVE-2020-10711

Mitre: CVE-2020-10711