Bug 1286966 - (CVE-2015-8370) CVE-2015-8370 grub2: buffer overflow when checking password entered during bootup
CVE-2015-8370 grub2: buffer overflow when checking password entered during bo...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 1288493 1288494 1290417
Blocks: 1286968
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Reported: 2015-12-01 04:09 EST by Martin Prpič
Modified: 2015-12-16 02:14 EST (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system.
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Clone Of:
Last Closed: 2015-12-15 06:07:38 EST
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Upstream fix (1.24 KB, patch)
2015-12-01 13:44 EST, Peter Jones
no flags Details | Diff

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:2623 normal SHIPPED_LIVE Moderate: grub2 security and bug fix update 2016-01-27 09:30:14 EST

  None (edit)
Description Martin Prpič 2015-12-01 04:09:42 EST
A buffer overflow flaw was found in the way grub2 checked the password entered by the user during bootup. A local attacker could use this flaw to circumvent the password check and, potentially, execute arbitrary code on the system.
Comment 1 Peter Jones 2015-12-01 13:44 EST
Created attachment 1100986 [details]
Upstream fix

Here's the fix.
Comment 7 Martin Prpič 2015-12-10 08:14:13 EST
Created grub2 tracking bugs for this issue:

Affects: fedora-all [bug 1290417]
Comment 8 Martin Prpič 2015-12-10 08:16:20 EST
This flaw has been presented at the CCN-CERT conference by the UPV security team:

Comment 9 errata-xmlrpc 2015-12-15 05:02:07 EST
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2623 https://rhn.redhat.com/errata/RHSA-2015-2623.html
Comment 10 Tomas Hoger 2015-12-15 09:14:05 EST
Detailed write-up from the original reporters.

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