Bug 1463361 (CVE-2017-9763)

Summary:	CVE-2017-9763 grub2: Stack exhaustion in grub_ext2_read_block
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	lkundrak, pjones
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Last Closed:	2019-06-08 03:15:27 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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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.