Bug 1463361 (CVE-2017-9763) - CVE-2017-9763 grub2: Stack exhaustion in grub_ext2_read_block
Summary: CVE-2017-9763 grub2: Stack exhaustion in grub_ext2_read_block
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2017-9763
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-06-20 15:57 UTC by Adam Mariš
Modified: 2019-09-29 14:15 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2019-06-08 03:15:27 UTC
Embargoed:

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Description Adam Mariš 2017-06-20 15:57:45 UTC 
The grub_ext2_read_block function in fs/ext2.c in GNU GRUB before 2013-11-12, as used in shlr/grub/fs/ext2.c in radare2 1.5.0, allows remote attackers to cause a denial of service (excessive stack use and application crash) via a crafted binary file, related to use of a variable-size stack array.

Upstream patch:

https://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/fs/ext2.c?id=ac8cac1dac50daaf1c390d701cca3b55e16ee768
Comment 1 Adam Mariš 2017-06-20 16:03:50 UTC 
This issue did not affect the versions of grub as shipped with Red Hat Enterprise Linux 5 and 6 as they did not contain affected function. This issue did not affect the versions of grub2 as shipped with Red Hat Enterprise Linux 7 as the patch is in place.
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