Bug 1852009 (CVE-2020-14308) - CVE-2020-14308 grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent heap-based buffer overflow
Summary: CVE-2020-14308 grub2: grub_malloc does not validate allocation size allowing ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-14308
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: 1853688 1853689 1853690 1853691 1853692 1853693 1853694 1853695 1853696 1853697 1853698 1853699 1863017
Blocks: 1852004
TreeView+ depends on / blocked
 
Reported: 2020-06-29 15:23 UTC by Marco Benatto
Modified: 2021-02-16 19:45 UTC (History)
5 users (show)

Fixed In Version: grub 2.06
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in current grub2 versions as shipped with Red Hat Enterprise Linux 7 and 8, where the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This issue leads the function to return invalid memory allocations, causing heap-based overflows in several code paths. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2020-07-29 19:27:46 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:3216 0 None None None 2020-07-29 18:30:38 UTC
Red Hat Product Errata RHSA-2020:3217 0 None None None 2020-07-29 19:34:02 UTC
Red Hat Product Errata RHSA-2020:3223 0 None None None 2020-07-29 19:37:47 UTC
Red Hat Product Errata RHSA-2020:3227 0 None None None 2020-07-29 20:14:44 UTC
Red Hat Product Errata RHSA-2020:3271 0 None None None 2020-08-03 11:52:26 UTC
Red Hat Product Errata RHSA-2020:3273 0 None None None 2020-08-03 10:57:02 UTC
Red Hat Product Errata RHSA-2020:3274 0 None None None 2020-08-03 12:05:50 UTC
Red Hat Product Errata RHSA-2020:3275 0 None None None 2020-08-03 11:13:59 UTC
Red Hat Product Errata RHSA-2020:3276 0 None None None 2020-08-03 12:02:21 UTC

Description Marco Benatto 2020-06-29 15:23:25 UTC 
Currently grub_malloc() function and related memory infrastructure underlying it doesn't fully validate the allocation size. This can lead
to arithmetic overflows leading to invalid memory allocations, which can be leverage to heap-based overflows in several code paths.
Comment 4 Marco Benatto 2020-07-03 15:04:30 UTC 
In the current grub versions, grub_malloc() malloc function doesn't validate if the allocation size may overflow the maximum type representation. This leads grub_malloc() to return invalid allocations, an attacker may leverage causing memory corruption leading to possible integrity, confidentiality and availability impacts. To be able to exploit this the attacker needs local privileged or physical access to the machine.
Comment 5 Marco Benatto 2020-07-07 13:41:24 UTC 
Acknowledgments:

Name: Chris Coulson (Ubuntu Security Team)
Comment 8 errata-xmlrpc 2020-07-29 18:30:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:3216 https://access.redhat.com/errata/RHSA-2020:3216
Comment 9 Product Security DevOps Team 2020-07-29 19:27:46 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-2020-14308
Comment 10 errata-xmlrpc 2020-07-29 19:34:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3217 https://access.redhat.com/errata/RHSA-2020:3217
Comment 11 errata-xmlrpc 2020-07-29 19:37:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2020:3223 https://access.redhat.com/errata/RHSA-2020:3223
Comment 12 errata-xmlrpc 2020-07-29 20:14:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

Via RHSA-2020:3227 https://access.redhat.com/errata/RHSA-2020:3227
Comment 13 errata-xmlrpc 2020-08-03 10:57:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Advanced Update Support

Via RHSA-2020:3273 https://access.redhat.com/errata/RHSA-2020:3273
Comment 14 errata-xmlrpc 2020-08-03 11:13:56 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-2020:3275 https://access.redhat.com/errata/RHSA-2020:3275
Comment 15 errata-xmlrpc 2020-08-03 11:52:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2020:3271 https://access.redhat.com/errata/RHSA-2020:3271
Comment 16 errata-xmlrpc 2020-08-03 12:02:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.3 Advanced Update Support
  Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.3 Telco Extended Update Support

Via RHSA-2020:3276 https://access.redhat.com/errata/RHSA-2020:3276
Comment 17 errata-xmlrpc 2020-08-03 12:05:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2020:3274 https://access.redhat.com/errata/RHSA-2020:3274
Comment 18 Marco Benatto 2020-08-03 13:45:23 UTC 
Created grub2 tracking bugs for this issue:

Affects: fedora-all [bug 1863017]
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