what you don't know can hurt you
Showing 1 - 2 of 2 RSS Feed

CVE-2021-3444

Status Candidate

Overview

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.

Related Files

Kernel Live Patch Security Notice LSN-0075-1
Posted Apr 7, 2021
Authored by Benjamin M. Romer

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly apply speculative execution limits on some pointer types. A local attacker could use this to expose sensitive information (kernel memory). It was discovered that the memory management subsystem in the Linux kernel did not properly handle copy-on-write operations in some situations. A local attacker could possibly use this to gain unintended write access to read-only memory pages. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2020-27170, CVE-2020-27171, CVE-2020-29372, CVE-2020-29374, CVE-2021-27363, CVE-2021-27364, CVE-2021-27365, CVE-2021-3444
MD5 | 485d57e139e0096fac110f9ec89736de
Ubuntu Security Notice USN-4887-1
Posted Mar 24, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4887-1 - De4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker could use this to expose sensitive information or possibly execute arbitrary code. Adam Nichols discovered that heap overflows existed in the iSCSI subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-27170, CVE-2020-27171, CVE-2021-27363, CVE-2021-27364, CVE-2021-27365, CVE-2021-3444
MD5 | ec10d1a53d4fcdd31e305a6e8e3837d5
Page 1 of 1
Back1Next

File Archive:

June 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jun 1st
    35 Files
  • 2
    Jun 2nd
    14 Files
  • 3
    Jun 3rd
    40 Files
  • 4
    Jun 4th
    22 Files
  • 5
    Jun 5th
    1 Files
  • 6
    Jun 6th
    1 Files
  • 7
    Jun 7th
    19 Files
  • 8
    Jun 8th
    14 Files
  • 9
    Jun 9th
    39 Files
  • 10
    Jun 10th
    20 Files
  • 11
    Jun 11th
    22 Files
  • 12
    Jun 12th
    2 Files
  • 13
    Jun 13th
    1 Files
  • 14
    Jun 14th
    32 Files
  • 15
    Jun 15th
    34 Files
  • 16
    Jun 16th
    0 Files
  • 17
    Jun 17th
    0 Files
  • 18
    Jun 18th
    0 Files
  • 19
    Jun 19th
    0 Files
  • 20
    Jun 20th
    0 Files
  • 21
    Jun 21st
    0 Files
  • 22
    Jun 22nd
    0 Files
  • 23
    Jun 23rd
    0 Files
  • 24
    Jun 24th
    0 Files
  • 25
    Jun 25th
    0 Files
  • 26
    Jun 26th
    0 Files
  • 27
    Jun 27th
    0 Files
  • 28
    Jun 28th
    0 Files
  • 29
    Jun 29th
    0 Files
  • 30
    Jun 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close