Bug 1959398 - CVE-2020-13529 systemd: crafted DHCP FORCERENEW packet can cause a server running the DHCP client to be vulnerable to a DHCP ACK spoofing attack [fedora-all]
Summary: CVE-2020-13529 systemd: crafted DHCP FORCERENEW packet can cause a server run...
Alias: None
Product: Fedora
Classification: Fedora
Component: systemd
Version: 34
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: systemd-maint
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: CVE-2020-13529
TreeView+ depends on / blocked
Reported: 2021-05-11 13:10 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-07-24 01:08 UTC (History)
11 users (show)

Fixed In Version: systemd-246.15-1.fc33
Doc Type: No Doc Update
Doc Text:
Clone Of:
Last Closed: 2021-05-11 18:05:03 UTC
Type: ---

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2021-05-11 13:10:14 UTC
This is an automatically created tracking bug!  It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.

For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.

For more information see:

When submitting as an update, use the fedpkg template provided in the next
comment(s).  This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.

Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.

NOTE: this issue affects multiple supported versions of Fedora. While only
one tracking bug has been filed, please correct all affected versions at
the same time.  If you need to fix the versions independent of each other,
you may clone this bug as appropriate.

Comment 1 Guilherme de Almeida Suckevicz 2021-05-11 13:10:19 UTC
Use the following template to for the 'fedpkg update' request to submit an
update for this issue as it contains the top-level parent bug(s) as well as
this tracking bug.  This will ensure that all associated bugs get updated
when new packages are pushed to stable.


# bugfix, security, enhancement, newpackage (required)

# low, medium, high, urgent (required)

# testing, stable

# Bug numbers: 1234,9876

# Description of your update
notes=Security fix for [PUT CVEs HERE]

# Enable request automation based on the stable/unstable karma thresholds

# Automatically close bugs when this marked as stable

# Suggest that users restart after update


Additionally, you may opt to use the bodhi web interface to submit updates:


Comment 2 Zbigniew Jędrzejewski-Szmek 2021-05-11 18:05:03 UTC
We discussed this with the reporters (before public disclosure), and after a lengthy discussion,
the asked the reporters to open a public bug. While it's something that could use an improvement,
and there's even an RFC, the RFC is not widely supported on the DHCP server side. So even if
systemd-networkd gets support, this is not enough to resolve the issue. And vulnerability of
DHCP to attacks on the local network is fairly widely understood and probably unavoidable in 
general. We're treating this as an RFE upstream, and I'll close this here.

Comment 3 Fedora Update System 2021-07-20 17:41:46 UTC
FEDORA-2021-166e461c8d has been submitted as an update to Fedora 33. https://bodhi.fedoraproject.org/updates/FEDORA-2021-166e461c8d

Comment 4 Fedora Update System 2021-07-21 01:15:34 UTC
FEDORA-2021-166e461c8d has been pushed to the Fedora 33 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-166e461c8d`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-166e461c8d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2021-07-24 01:08:09 UTC
FEDORA-2021-166e461c8d has been pushed to the Fedora 33 stable repository.
If problem still persists, please make note of it in this bug report.

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