Bug 674210 (CVE-2018-20482)

Summary:	<app-arch/tar-1.30-r1: mishandles file shrinkage during read access
Product:	Gentoo Security	Reporter:	D'juan McDonald (domhnall) <flopwiki>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	CC:	base-system
Priority:	Normal	Flags:	stable-bot: sanity-check+
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
Whiteboard:	A3 [glsa+ cve]
Package list:	app-arch/tar-1.31-r1	Runtime testing required:	---
Bug Depends on:	675140
Bug Blocks:

Description D'juan McDonald (domhnall) 2018-12-31 23:31:52 UTC

(https://nvd.nist.gov/vuln/detail/CVE-2018-20482):

GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

Upstream Patch: http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42c

Comment 1 Larry the Git Cow gentoo-dev

2019-01-01 14:38:09 UTC

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a3a8c469b2bb96d3ee3a4fa99bb5b30aa38c7589

commit a3a8c469b2bb96d3ee3a4fa99bb5b30aa38c7589
Author:     Lars Wendler <polynomial-c@gentoo.org>
AuthorDate: 2019-01-01 14:36:33 +0000
Commit:     Lars Wendler <polynomial-c@gentoo.org>
CommitDate: 2019-01-01 14:38:01 +0000

    app-arch/tar: Revbump to fix CVE-2018-20482
    
    Patch added without new test suite because that would require
    an eautoreconf run.
    
    Bug: https://bugs.gentoo.org/674210
    Package-Manager: Portage-2.3.53, Repoman-2.3.12
    Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>

 app-arch/tar/files/tar-1.30-CVE-2018-20482.patch | 146 +++++++++++++++++++++++
 app-arch/tar/tar-1.30-r1.ebuild                  |  82 +++++++++++++
 2 files changed, 228 insertions(+)

Comment 2 Thomas Deutschmann (RETIRED) gentoo-dev

2019-01-03 20:31:34 UTC

Let's go with =app-arch/tar-1.31 which has additional buffer overflow fixes.


@ arches,

please test and mark stable: =app-arch/tar-1.31

Comment 3 Thomas Deutschmann (RETIRED) gentoo-dev

2019-01-04 00:03:14 UTC

x86 stable

Comment 4 Mikle Kolyada (RETIRED) archtester

2019-01-04 10:38:05 UTC

amd64 stable

Comment 5 Rolf Eike Beer archtester

2019-01-05 19:48:23 UTC

sparc stable

Comment 6 Sergei Trofimovich (RETIRED) gentoo-dev

2019-01-05 22:48:01 UTC

ia64/ppc/ppc64 stable

Comment 7 Mart Raudsepp gentoo-dev

2019-01-06 22:27:14 UTC

arm64 stable

Comment 8 Matt Turner gentoo-dev

2019-01-22 07:15:58 UTC

alpha stable

Comment 9 Markus Meier gentoo-dev

2019-01-30 18:49:43 UTC

arm stable

Comment 10 Mikle Kolyada (RETIRED) archtester

2019-02-12 09:14:48 UTC

s390 stable

Comment 11 Mikle Kolyada (RETIRED) archtester

2019-02-12 09:15:40 UTC

sh stable

Comment 12 Mikle Kolyada (RETIRED) archtester

2019-02-12 09:16:34 UTC

m68k stable

Comment 13 Mikle Kolyada (RETIRED) archtester

2019-03-10 16:12:49 UTC

hppa stable

Comment 14 GLSAMaker/CVETool Bot gentoo-dev

2019-03-10 20:05:37 UTC

This issue was resolved and addressed in
 GLSA 201903-05 at https://security.gentoo.org/glsa/201903-05
by GLSA coordinator Aaron Bauman (b-man).