Bug 711136 (CVE-2019-20044)

Summary:	<app-shells/zsh-5.8: insecure dropping of privileges when unsetting PRIVILEGED option (CVE-2019-20044)
Product:	Gentoo Security	Reporter:	Sam James <sam>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	minor	CC:	polynomial-c
Priority:	Normal	Flags:	stable-bot: sanity-check+
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://www.zsh.org/mla/zsh-announce/141
Whiteboard:	B3 [glsa+ cve]
Package list:	app-shells/zsh-5.8	Runtime testing required:	---

Description Sam James archtester

2020-03-01 02:02:47 UTC

"In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid()."

MITRE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20044
Affects: <5.8

Comment 1 Agostino Sarubbo gentoo-dev

2020-03-01 13:04:35 UTC

amd64 stable

Comment 2 Agostino Sarubbo gentoo-dev

2020-03-02 12:30:38 UTC

sparc stable

Comment 3 Agostino Sarubbo gentoo-dev

2020-03-02 12:33:21 UTC

x86 stable

Comment 4 Sergei Trofimovich (RETIRED) gentoo-dev

2020-03-02 12:37:04 UTC

ia64/ppc/ppc64 stable

Comment 5 Agostino Sarubbo gentoo-dev

2020-03-05 12:50:10 UTC

arm stable

Comment 6 Mart Raudsepp gentoo-dev

2020-03-14 21:51:52 UTC

arm64 stable

Comment 7 Rolf Eike Beer archtester

2020-03-16 17:46:50 UTC

hppa stable

Comment 8 Sam James archtester

2020-03-18 20:05:53 UTC

Thanks arches.

Maintainer(s), please drop the vulnerable version(s).

Comment 9 Larry the Git Cow gentoo-dev

2020-03-18 20:55:25 UTC

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8a12520a673e400902c64889848cc413746fc87c

commit 8a12520a673e400902c64889848cc413746fc87c
Author:     Lars Wendler <polynomial-c@gentoo.org>
AuthorDate: 2020-03-18 20:55:09 +0000
Commit:     Lars Wendler <polynomial-c@gentoo.org>
CommitDate: 2020-03-18 20:55:09 +0000

    app-shells/zsh: Security cleanup
    
    Bug: https://bugs.gentoo.org/711136
    Package-Manager: Portage-2.3.94, Repoman-2.3.21
    Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>

 app-shells/zsh/Manifest            |   2 -
 app-shells/zsh/zsh-5.7.1-r1.ebuild | 221 -------------------------------------
 2 files changed, 223 deletions(-)

Comment 10 Sam James archtester

2020-03-19 19:00:18 UTC

Thanks all.

Comment 11 Thomas Deutschmann (RETIRED) gentoo-dev

2020-03-25 20:13:21 UTC

GLSA Vote: Yes

New GLSA request filed.

Comment 12 GLSAMaker/CVETool Bot gentoo-dev

2020-03-25 20:24:24 UTC

This issue was resolved and addressed in
 GLSA 202003-55 at https://security.gentoo.org/glsa/202003-55
by GLSA coordinator Thomas Deutschmann (whissi).