ALAS-2020-1366

Amazon Linux 1 Security Advisory: ALAS-2020-1366
Advisory Release Date: 2020-05-11 20:43 Pacific
Advisory Updated Date: 2020-06-17 23:45 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)

A flaw was found in the Linux kernel loose validation of child/parent process identification handling while filtering signal handlers. A local attacker is able to abuse this flaw to bypass checks to send any signal to a privileged process. (CVE-2020-12826)

A flaw was found in the Linux kernel's implementation of the BFQ IO scheduler. This flaw allows a local user able to groom system memory to cause kernel memory corruption and possible privilege escalation by abusing a race condition in the IO scheduler. (CVE-2020-12657)


Affected Packages:

kernel


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

New Packages:
i686:
    kernel-debuginfo-common-i686-4.14.177-107.254.amzn1.i686
    kernel-headers-4.14.177-107.254.amzn1.i686
    kernel-devel-4.14.177-107.254.amzn1.i686
    kernel-tools-4.14.177-107.254.amzn1.i686
    kernel-tools-devel-4.14.177-107.254.amzn1.i686
    kernel-debuginfo-4.14.177-107.254.amzn1.i686
    kernel-4.14.177-107.254.amzn1.i686
    perf-4.14.177-107.254.amzn1.i686
    perf-debuginfo-4.14.177-107.254.amzn1.i686
    kernel-tools-debuginfo-4.14.177-107.254.amzn1.i686

src:
    kernel-4.14.177-107.254.amzn1.src

x86_64:
    kernel-debuginfo-common-x86_64-4.14.177-107.254.amzn1.x86_64
    kernel-tools-debuginfo-4.14.177-107.254.amzn1.x86_64
    kernel-4.14.177-107.254.amzn1.x86_64
    kernel-devel-4.14.177-107.254.amzn1.x86_64
    kernel-tools-devel-4.14.177-107.254.amzn1.x86_64
    kernel-headers-4.14.177-107.254.amzn1.x86_64
    perf-4.14.177-107.254.amzn1.x86_64
    kernel-debuginfo-4.14.177-107.254.amzn1.x86_64
    perf-debuginfo-4.14.177-107.254.amzn1.x86_64
    kernel-tools-4.14.177-107.254.amzn1.x86_64

Additional References

Red Hat: CVE-2020-10711, CVE-2020-12657, CVE-2020-12826

Mitre: CVE-2020-10711, CVE-2020-12657, CVE-2020-12826