Bug 879209 (CVE-2022-43995) – <app-admin/sudo-1.9.12-r1: buffer overflow with very small passwords

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description John Helmert III 2022-11-02 20:21:54 UTC]

CVE-2022-43995 (https://www.sudo.ws/security/advisories/):

Sudo 1.8.0 through 1.9.12, with the crypt() password backend, contains a plugins/sudoers/auth/passwd.c array-out-of-bounds error that can result in a heap-based buffer over-read. This can be triggered by arbitrary local users with access to Sudo by entering a password of seven characters or fewer. The impact could vary depending on the compiler and processor architecture.

[Comment 1 Larry the Git Cow 2022-11-05 02:07:26 UTC]

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=5eca952121b4f64dc7c40f81338384bf299ee771

commit 5eca952121b4f64dc7c40f81338384bf299ee771
Author:     John Helmert III <[e-mail]>
AuthorDate: 2022-11-05 00:39:58 +0000
Commit:     Sam James <[e-mail]>
CommitDate: 2022-11-05 02:06:35 +0000

    app-admin/sudo: patch CVE-2022-43995
    
    Bug: https://bugs.gentoo.org/879209
    Signed-off-by: John Helmert III <[e-mail]>
    Closes: https://github.com/gentoo/gentoo/pull/28143
    Signed-off-by: Sam James <[e-mail]>

 .../sudo/files/sudo-1.9.12-CVE-2022-43995.patch    |  53 ++++
 app-admin/sudo/sudo-1.9.12-r1.ebuild               | 287 +++++++++++++++++++++
 2 files changed, 340 insertions(+)

[Comment 2 Larry the Git Cow 2022-11-06 03:59:58 UTC]

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=bd464e04dac31f761430fb3c8f2cb940f3f44463

commit bd464e04dac31f761430fb3c8f2cb940f3f44463
Author:     Sam James <[e-mail]>
AuthorDate: 2022-11-06 03:35:55 +0000
Commit:     Sam James <[e-mail]>
CommitDate: 2022-11-06 03:36:47 +0000

    app-admin/sudo: add 1.9.12_p1
    
    Note that CVE-2022-43995 was already fixed in Gentoo in 1.9.12-r1
    (5eca952121b4f64dc7c40f81338384bf299ee771) but tagging the bug
    for completeness.
    
    Bug: https://bugs.gentoo.org/879209
    Closes: https://bugs.gentoo.org/862201
    Signed-off-by: Sam James <[e-mail]>

 app-admin/sudo/Manifest              |   2 +
 app-admin/sudo/sudo-1.9.12_p1.ebuild | 286 +++++++++++++++++++++++++++++++++++
 app-admin/sudo/sudo-9999.ebuild      |  14 +-
 3 files changed, 297 insertions(+), 5 deletions(-)

[Comment 3 John Helmert III 2022-11-18 21:12:07 UTC]

GLSA request filed

[Comment 4 Larry the Git Cow 2022-11-22 04:01:16 UTC]

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

https://gitweb.gentoo.org/data/glsa.git/commit/?id=90304100a99e24458f3a757fd7288607e1786e6b

commit 90304100a99e24458f3a757fd7288607e1786e6b
Author:     GLSAMaker <[e-mail]>
AuthorDate: 2022-11-22 03:52:48 +0000
Commit:     John Helmert III <[e-mail]>
CommitDate: 2022-11-22 03:59:40 +0000

    [ GLSA 202211-08 ] sudo: Heap-Based Buffer Overread
    
    Bug: https://bugs.gentoo.org/879209
    Signed-off-by: GLSAMaker <[e-mail]>
    Signed-off-by: John Helmert III <[e-mail]>

 glsa-202211-08.xml | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

[Comment 5 John Helmert III 2022-11-22 04:04:52 UTC]

GLSA released, waiting for cleanup

[Comment 6 Teika kazura 2022-11-22 05:45:06 UTC]

For users' clarity: 1.9.12_p1 includes the fix. See e.g. the git log:
https://gitweb.gentoo.org/repo/gentoo.git/log/app-admin/sudo?showmsg=1

[Comment 7 John Helmert III 2022-11-22 05:48:44 UTC]

(In reply to Teika kazura from comment #6)
> For users' clarity: 1.9.12_p1 includes the fix. See e.g. the git log:
> https://gitweb.gentoo.org/repo/gentoo.git/log/app-admin/sudo?showmsg=1

You mean the commits that referenced this bug and are thus included as comments in this bug? ;)