10 Oct
2023
10 Oct
'23
8:58 p.m.
Hi,
Apologies for exposing my ignorance in public like this, but can somebody tell me how
I'd know if my Debian Bookworm system has been patched to ensure it's no longer
vulnerable to the "Looney Tunables" privilege escalation
(https://www.debian.org/security/2023/dsa-5514)?
The fix is apparently in the most recent glibc source package. I don't seem to have
that glibc package installed (and it's a source package, not a binary?), but I read
that stock installs of Debian (and most linuxes) are vulnerable. Which actual binary
packages need to be updated to fix the vulnerability in the dynamic loader, and how does
this relate to the source package?
Cheers,
jmi
--
Jamie MacIsaac
jamie(a)macisa.ac
11 Oct
11 Oct
6:36 a.m.
On 10/10/2023 21:58, Jamie MacIsaac via BitFolk Users wrote:
Apologies for exposing my ignorance in public like
this, but can somebody tell me how I'd know if my Debian Bookworm system has been
patched to ensure it's no longer vulnerable to the "Looney Tunables"
privilege escalation (https://www.debian.org/security/2023/dsa-5514)?
The fix is apparently in the most recent glibc source package. I don't seem to have
that glibc package installed (and it's a source package, not a binary?), but I read
that stock installs of Debian (and most linuxes) are vulnerable. Which actual binary
packages need to be updated to fix the vulnerability in the dynamic loader, and how does
this relate to the source package?
Hello Jamie.
Good Linux communities are always open to questions and providing help.
According to https://security-tracker.debian.org/tracker/CVE-2023-4911
this is fixed in the security release 2.36-9+deb12u3.
Make sure that you have the following line in /etc/apt/sources.list, or
in a file with a .list extension within the sources.list.d directory:
deb http://security.debian.org/debian-security bookworm-security
main contrib non-free non-free-firmware
Run `apt update` and then `apt upgrade` and this should get that update
if you don't have it already.
As you saw, glibc-source is a source package which you are unlikely to
have unless you compile executables on that machine, and so I think the
main package you need to check is *libc-bin* (edit: and *libc6*).
To see what version you are running run `apt show libc-bin` (and repeat
for libc6) and look at the 'Version' line.
In my case I'm still on Bullseye, but checking the package changelog
confirms that the version I have has been patched. The Bookworm
changelog is at
https://metadata.ftp-master.debian.org/changelogs/main/g/glibc/glibc_2.36-9…
Gavin
7:34 a.m.
On Wed, 11 Oct 2023, at 7:36 AM, Gavin Westwood via BitFolk Users wrote:
According to
https://security-tracker.debian.org/tracker/CVE-2023-4911 this is fixed in the security
release 2.36-9+deb12u3.
I always install the apticron package on my Debian boxes (apt install apticron). It runs
once a day and lets you know when there are updates to install. It emails root by default,
but you can change that (or, even better, alias root to an email address that you check
often).
Cheers,
Mike
7:50 a.m.
On Wed, 11 Oct 2023, at 07:36, Gavin Westwood via BitFolk Users wrote:
As you saw, glibc-source is a source package which you
are unlikely to have unless you compile executables on that machine, and so I think the
main package you need to check is *libc-bin* (edit: and *libc6*).
To see what version you are running run `apt show libc-bin` (and repeat for libc6) and
look at the 'Version' line.
Yep, that makes a lot more sense, Thank you (and Mike) for your helpful replies!
Cheers,
jmi
--
Jamie MacIsaac
jamie(a)macisa.ac
201
days inactive
202
days old
3 comments
3 participants
participants (3)
-
Gavin Westwood -
Jamie MacIsaac -
Mike Zanker