Bug 1126713 - rsync: checksum collisions leading to a denial of service [fedora-all]
Summary: rsync: checksum collisions leading to a denial of service [fedora-all]
Alias: None
Product: Fedora
Classification: Fedora
Component: rsync
Version: 20
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Luboš Uhliarik ✈
QA Contact: Fedora Extras Quality Assurance
Whiteboard: fst_owner=bvincent
: 483056 (view as bug list)
Depends On:
Blocks: fedora-sha2
TreeView+ depends on / blocked
Reported: 2014-08-05 06:28 UTC by Murray McAllister
Modified: 2015-06-29 21:56 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Release Note
Doc Text:
Clone Of:
Last Closed: 2015-06-29 21:56:37 UTC

Attachments (Terms of Use)
Very rough patch (126.25 KB, patch)
2015-04-16 05:38 UTC, Michael Samuel
mik: review-
Details | Diff

Description Murray McAllister 2014-08-05 06:28:18 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.

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

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When submitting as an update, use the fedpkg template provided in the next
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Please also mention the CVE IDs being fixed in the RPM changelog and the
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NOTE: this issue affects multiple supported versions of Fedora. While only
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[bug automatically created by: add-tracking-bugs]

Comment 1 Murray McAllister 2014-08-05 06:28:29 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)

# testing, stable

# Bug numbers: 1234,9876

# Description of your update
notes=Security fix for 

# 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 update submission link instead:


Comment 2 Michal Luscon 2014-08-22 11:39:36 UTC
*** Bug 483056 has been marked as a duplicate of this bug. ***

Comment 3 Fedora Admin XMLRPC Client 2014-09-30 12:14:14 UTC
This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.

Comment 5 Fedora Admin XMLRPC Client 2015-04-09 10:22:02 UTC
This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.

Comment 6 Michael Samuel 2015-04-16 05:38:57 UTC
Created attachment 1015031 [details]
Very rough patch

This is a patch I sent to Wayne Davison on 22nd July 2014.  It is not "production ready" - just a starting point to see how things fit.

It adds in libdetectcoll from Marc Stevens - it's compatible with the normal MD5_Update() interface, but adds a return value to tell when a collision attempt is detected.  In these cases a full transfer should be done rather than partial.

It also pulls in blake2b as a hash function with a new protocol number (old clients will still used md5 or md4, depending on how old).

I don't even know if this works, it was really just a (failed) way to start a discussion.  Hopefully somebody can pick this up and beat it into shape.  Cleaning up libdetectcoll itself to use rsync's print functions etc would be a minimum requirement, I'd guess.

Comment 7 Fedora End Of Life 2015-05-29 12:33:52 UTC
This message is a reminder that Fedora 20 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 20. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
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Comment 8 Fedora End Of Life 2015-06-29 21:56:37 UTC
Fedora 20 changed to end-of-life (EOL) status on 2015-06-23. Fedora 20 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

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