Bug 1580924 – CVE-2017-18269 glibc: memory corruption in memcpy-sse2-unaligned.S

Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.

Bug 1580924 - (CVE-2017-18269) CVE-2017-18269 glibc: memory corruption in memcpy-sse2-unaligned.S

Summary:	CVE-2017-18269 glibc: memory corruption in memcpy-sse2-unaligned.S

Status:	NEW

Aliases:	CVE-2017-18269

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20171224,repor...
Keywords:	Security

Depends On:	1581365 1580934 1582354 1582355
Blocks:	1580945
	Show dependency tree / graph

Reported:	2018-05-21 17:17 EDT by Laura Pardo
Modified:	2018-08-10 03:30 EDT (History)
CC List:	19 users (show)

See Also:
Fixed In Version:	glibc 2.28
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Sourceware	22644	None	None	None	2018-05-22 01:30 EDT

Groups: None (edit)

Description Laura Pardo 2018-05-21 17:17:45 EDT

A flaw was found in the GNU C Library (aka glibc or libc6) 2.21 through 2.27. An SSE2-optimized memmove implementation for i386 in sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S does not correctly perform the overlapping memory check if the source memory range spans the middle of the address space, resulting in corrupt data being produced by the copy operation. This may disclose information to context-dependent attackers, or result in a denial of service, or, possibly, code execution.


References:
https://github.com/fingolfin/memmove-bug
https://sourceware.org/bugzilla/show_bug.cgi?id=22644

Patch:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cd66c0e584c6d692bc8347b5e72723d02b8a8ada

Comment 1 Laura Pardo 2018-05-21 17:18:28 EDT

Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1580934]

Comment 4 Riccardo Schirone 2018-05-22 11:15:39 EDT

Statement:

This issue did not affect the versions of glibc and compat-glibc as shipped with Red Hat Enterprise Linux 5, 6 and 7 as they did not include the vulnerable code.

Note You need to log in before you can comment on or make changes to this bug.