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Bug 1581274 - (CVE-2018-11237) CVE-2018-11237 glibc: Buffer overflow in __mempcpy_avx512_no_vzeroupper
CVE-2018-11237 glibc: Buffer overflow in __mempcpy_avx512_no_vzeroupper
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180517,repor...
: Security
Depends On: 1581276 1579809 1581275 1582349 1582350
Blocks: 1581278
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Reported: 2018-05-22 08:53 EDT by Andrej Nemec
Modified: 2018-10-30 03:36 EDT (History)
19 users (show)

See Also:
Fixed In Version: glibc 2.28
Doc Type: If docs needed, set a value
Doc Text:
A buffer overflow has been discovered in the GNU C Library (aka glibc or libc6) in the __mempcpy_avx512_no_vzeroupper function when particular conditions are met. An attacker could use this vulnerability to cause a denial of service or potentially execute code.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:3092 None None None 2018-10-30 03:36 EDT

  None (edit)
Description Andrej Nemec 2018-05-22 08:53:11 EDT 
An AVX-512-optimized implementation of the mempcpy function in the GNU C Library (aka glibc or libc6) 2.27 and earlier may write data beyond the target buffer, leading to a buffer overflow in __mempcpy_avx512_no_vzeroupper.

Upstream issue:

https://sourceware.org/bugzilla/show_bug.cgi?id=23196

Product bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1579809
Comment 1 Andrej Nemec 2018-05-22 08:54:30 EDT 
Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1581275]
Comment 5 Riccardo Schirone 2018-05-24 04:25:23 EDT 
The vulnerable code can be reached only in particular configurations and in particular cases. First, mempcpy has to be resolved to __mempcpy_avx512_no_vzeroupper, thus the CPU needs to support AVX512 instructions. Moreover, the size to be copied has to be greater than a dynamic value internal to glibc and other conditions need to apply.

For these reasons, I'm setting Attack Complexity to High (AC:H).
Comment 9 errata-xmlrpc 2018-10-30 03:36:24 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3092 https://access.redhat.com/errata/RHSA-2018:3092
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