Bug 1886936 (CVE-2020-25647) - CVE-2020-25647 grub2: Out-of-bounds write in grub_usb_device_initialize()
Summary: CVE-2020-25647 grub2: Out-of-bounds write in grub_usb_device_initialize()
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-25647
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1913890 1913891 1913892 1913893 1913894 1913895 1913896 1913897 1913898 1913899 1913900 1932555 1932556 1932558 1932559 1932560 1932561 1932562 1932563 1932564 1932565 1932566 1932567 1932568 1932569 1932570 1932571 1932572 1932573 1932574 1932575 1932576 1932577 1932578 1932579 1932580 1932581 1932582 1932583 1932584 1932585 1932883 1932884 1934248 1989986 1989991 1990885 1990886 1990888 1990890
Blocks: 1899965
TreeView+ depends on / blocked
 
Reported: 2020-10-09 18:56 UTC by Marco Benatto
Modified: 2023-09-26 14:56 UTC (History)
7 users (show)

Fixed In Version: grub 2.06
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in grub2. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-03-03 01:02:01 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2021:0730 0 None None None 2021-03-04 13:49:58 UTC
Red Hat Product Errata RHBA-2021:0731 0 None None None 2021-03-04 14:03:33 UTC
Red Hat Product Errata RHBA-2021:0791 0 None None None 2021-03-09 20:47:48 UTC
Red Hat Product Errata RHSA-2021:0696 0 None None None 2021-03-02 19:21:20 UTC
Red Hat Product Errata RHSA-2021:0697 0 None None None 2021-03-02 19:25:13 UTC
Red Hat Product Errata RHSA-2021:0698 0 None None None 2021-03-02 19:17:03 UTC
Red Hat Product Errata RHSA-2021:0699 0 None None None 2021-03-02 20:47:59 UTC
Red Hat Product Errata RHSA-2021:0700 0 None None None 2021-03-02 20:50:35 UTC
Red Hat Product Errata RHSA-2021:0701 0 None None None 2021-03-02 21:01:52 UTC
Red Hat Product Errata RHSA-2021:0702 0 None None None 2021-03-02 20:09:36 UTC
Red Hat Product Errata RHSA-2021:0703 0 None None None 2021-03-02 19:36:34 UTC
Red Hat Product Errata RHSA-2021:0704 0 None None None 2021-03-02 19:53:44 UTC
Red Hat Product Errata RHSA-2021:2566 0 None None None 2021-06-29 16:26:20 UTC
Red Hat Product Errata RHSA-2021:2790 0 None None None 2021-07-20 22:09:06 UTC
Red Hat Product Errata RHSA-2021:3675 0 None None None 2021-09-28 14:34:39 UTC

Description Marco Benatto 2020-10-09 18:56:26 UTC 
grub_usb_device_initialize() is called to handle USB device initialization. it reads out the descriptors it needs from the USB device and uses that data to fill in some USB data structures. grub_usb_device_initialize() performs very little bounds checking and simply assumes the USB device provides sane values. This behavior can trigger memory corruption. If properly exploited, this would lead to arbitrary code execution allowing the attacker to by-pass SecureBoot mechanism.
Comment 2 Marco Benatto 2020-12-29 14:56:58 UTC 
Acknowledgments:

Name: Joseph Tartaro (IOActive), Ilja van Sprundel (IOActive)
Comment 6 Marco Benatto 2021-02-25 15:34:43 UTC 
Marking fwupdate as WONTFIX for all rhel8 streams. This package was made obsolete and replaced by fwupd.
Comment 7 Marco Benatto 2021-03-02 18:39:44 UTC 
Created grub2 tracking bugs for this issue:

Affects: fedora-all [bug 1934248]
Comment 8 errata-xmlrpc 2021-03-02 19:17:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:0698 https://access.redhat.com/errata/RHSA-2021:0698
Comment 9 errata-xmlrpc 2021-03-02 19:21:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:0696 https://access.redhat.com/errata/RHSA-2021:0696
Comment 10 errata-xmlrpc 2021-03-02 19:25:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:0697 https://access.redhat.com/errata/RHSA-2021:0697
Comment 11 errata-xmlrpc 2021-03-02 19:36:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Advanced Update Support

Via RHSA-2021:0703 https://access.redhat.com/errata/RHSA-2021:0703
Comment 12 errata-xmlrpc 2021-03-02 19:53:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Advanced Update Support

Via RHSA-2021:0704 https://access.redhat.com/errata/RHSA-2021:0704
Comment 13 errata-xmlrpc 2021-03-02 20:09:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support
  Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2021:0702 https://access.redhat.com/errata/RHSA-2021:0702
Comment 14 errata-xmlrpc 2021-03-02 20:47:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:0699 https://access.redhat.com/errata/RHSA-2021:0699
Comment 15 errata-xmlrpc 2021-03-02 20:50:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2021:0700 https://access.redhat.com/errata/RHSA-2021:0700
Comment 16 errata-xmlrpc 2021-03-02 21:01:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2021:0701 https://access.redhat.com/errata/RHSA-2021:0701
Comment 17 Product Security DevOps Team 2021-03-03 01:02:01 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25647
Comment 18 errata-xmlrpc 2021-05-18 14:37:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1734 https://access.redhat.com/errata/RHSA-2021:1734
Comment 19 errata-xmlrpc 2021-06-29 16:26:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:2566 https://access.redhat.com/errata/RHSA-2021:2566
Comment 20 errata-xmlrpc 2021-07-20 22:09:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:2790 https://access.redhat.com/errata/RHSA-2021:2790
Comment 21 errata-xmlrpc 2021-09-28 14:34:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:3675 https://access.redhat.com/errata/RHSA-2021:3675
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