Bug 866716 (CVE-2021-35937, CVE-2021-35938, CVE-2021-35939) – <app-arch/rpm-4.18.0: multiple vulnerabilities

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description John Helmert III 2022-08-26 16:06:19 UTC]

CVE-2021-35937:

A race condition vulnerability was found in rpm. A local unprivileged user could use this flaw to bypass the checks that were introduced in response to CVE-2017-7500 and CVE-2017-7501, potentially gaining root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

RedHat bug says this will be in 4.18: https://bugzilla.redhat.com/show_bug.cgi?id=1964125
https://rpm.org/wiki/Releases/4.18.0

CVE-2021-35938:

A symbolic link issue was found in rpm. It occurs when rpm sets the desired permissions and credentials after installing a file. A local unprivileged user could use this flaw to exchange the original file with a symbolic link to a security-critical file and escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

RedHat bug: https://bugzilla.redhat.com/show_bug.cgi?id=1964114):
Patch in 4.18: https://github.com/rpm-software-management/rpm/commit/25a435e90844ea98fe5eb7bef22c1aecf3a9c033

[Comment 1 John Helmert III 2022-08-26 18:48:11 UTC]

CVE-2021-35939:

It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

RedHat bug: https://bugzilla.redhat.com/show_bug.cgi?id=1964129
Patch is in 4.18.0: https://github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556

[Comment 2 John Helmert III 2022-10-21 17:57:14 UTC]

GLSA request filed.

[Comment 3 Larry the Git Cow 2022-10-25 21:55:47 UTC]

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1dbbdcdb43b2c2dab997bc818c96b315e48fff77

commit 1dbbdcdb43b2c2dab997bc818c96b315e48fff77
Author:     John Helmert III <[e-mail]>
AuthorDate: 2022-10-25 21:37:09 +0000
Commit:     John Helmert III <[e-mail]>
CommitDate: 2022-10-25 21:55:39 +0000

    app-arch/rpm: drop 4.17.1
    
    Bug: https://bugs.gentoo.org/866716
    Signed-off-by: John Helmert III <[e-mail]>

 app-arch/rpm/Manifest          |   1 -
 app-arch/rpm/rpm-4.17.1.ebuild | 161 -----------------------------------------
 2 files changed, 162 deletions(-)

[Comment 4 Larry the Git Cow 2022-10-31 01:42:20 UTC]

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

https://gitweb.gentoo.org/data/glsa.git/commit/?id=d1fba8b4347d1cc39def2710ba7880b64f060ea2

commit d1fba8b4347d1cc39def2710ba7880b64f060ea2
Author:     GLSAMaker <[e-mail]>
AuthorDate: 2022-10-31 01:15:56 +0000
Commit:     John Helmert III <[e-mail]>
CommitDate: 2022-10-31 01:40:15 +0000

    [ GLSA 202210-22 ] RPM: Multiple Vulnerabilities
    
    Bug: https://bugs.gentoo.org/830380
    Bug: https://bugs.gentoo.org/866716
    Signed-off-by: GLSAMaker <[e-mail]>
    Signed-off-by: John Helmert III <[e-mail]>

 glsa-202210-22.xml | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

[Comment 5 John Helmert III 2022-10-31 02:18:46 UTC]

GLSA released, all done!