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Maniphest T91203

ApiUpload allows overrun without error
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Description

In chunked mode, ApiUpload allows a client to send data past the stated filesize. If the filesize parameter is kept suitably small, I believe a badly coded or malicious client could conceivably upload indefinitely.

patches:

  • Patches for both this issue and T91205 are attached to T91205.

affected versions:
type: DoS
CVE: CVE-2015-8001

Details

SubjectRepoBranchLines +/-
SECURITY: API: Improve validation in chunked uploadingmediawiki/coremaster+90 -16
SECURITY: API: Improve validation in chunked uploadingmediawiki/coreREL1_26+90 -16
SECURITY: API: Improve validation in chunked uploadingmediawiki/coreREL1_23+89 -17
SECURITY: API: Improve validation in chunked uploadingmediawiki/coreREL1_24+89 -17
SECURITY: API: Improve validation in chunked uploadingmediawiki/coreREL1_25+89 -16
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StatusSubtypeAssignedTask
 ResolvedNoneT108064 MediaWiki Security release 1.25.3
 ResolvedAnomieT91203 ApiUpload allows overrun without error

Event Timeline

RobinHood70 created this task.Mar 1 2015, 6:44 PM
RobinHood70 raised the priority of this task from to Low.
RobinHood70 updated the task description. (Show Details)
RobinHood70 added a project: MediaWiki-Action-API.
RobinHood70 subscribed.
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 1 2015, 6:44 PM
Ciencia_Al_Poder set Security to Software security bug.Mar 1 2015, 6:58 PM
Ciencia_Al_Poder subscribed.
Restricted Application changed the visibility from "Public (No Login Required)" to "Custom Policy". · View Herald TranscriptMar 1 2015, 6:58 PM
Restricted Application changed the edit policy from "All Users" to "Custom Policy". · View Herald Transcript
Restricted Application added a project: acl*security. · View Herald Transcript
Ciencia_Al_Poder added a comment.Mar 1 2015, 7:00 PM

I've preemptively activated the security flag of this bug just in case this could be a real security issue, as the description suggests.

Anomie subscribed.Mar 2 2015, 7:28 PM

The filesize can never be bigger than $wgMaxUploadSize, so they can't keep increasing it indefinitely.

But it does seem the API could use some additional input validation, as I don't see anything that checks whether the supplied offset plus the length of the chunk is greater than the claimed filesize, and doing so would allow uploading until overflow on the offset parameter.

Anomie claimed this task.EditedMar 2 2015, 10:00 PM

0001-API-Improve-validation-in-chunked-uploading.patch10 KBDownload

Anomie added a project: Patch-For-Review.Mar 2 2015, 10:00 PM
Anomie moved this task from Unsorted to Needs Review on the MediaWiki-Action-API board.
Anomie added a project: MediaWiki-Core-Team.
Anomie moved this task from Backlog to Needs Review/Feedback on the MediaWiki-Core-Team board.
RobinHood70 added a comment.Mar 2 2015, 10:29 PM

The filesize can never be bigger than $wgMaxUploadSize, so they can't keep increasing it indefinitely.

Just to follow-up here for those not following T91205, they don't actually need to increase filesize currently. As long as the so-called final chunk exceeds the filesize rather than equalling it, the upload can continue. You can set filesize to 1000, upload 2000 bytes in a chunk, then continue uploading data for as long as you wish, as long as you continue to claim that the filesize is 1000 bytes. The patch you've submitted at T91205 will fix that issue.

• ksmith subscribed.Mar 24 2015, 10:49 PM

Anomie: Can you (or someone) post a comment here showing the current status of this?

• csteipp subscribed.Mar 25 2015, 1:24 AM

I reviewed the patch (I think it's the same one?) on T91205. I'll deploy it to the cluster in the near future. T91205 / this issue will get patched in 1.24.3, probably next month.

Anomie added a comment.Mar 25 2015, 2:43 PM
In T91203#1147431, @csteipp wrote:

I reviewed the patch (I think it's the same one?) on T91205.

Yes, same patch. I suppose I could have split them up, but the two would probably merge-conflict or one would depend on the other.

Anomie edited projects, added Reading-Infrastructure-Team-Old (Don't use); removed MediaWiki-Core-Team.Mar 30 2015, 7:45 PM
Anomie moved this task from Backlog to Done on the Reading-Infrastructure-Team-Old (Don't use) board.
Anomie closed this task as Resolved.Sep 10 2015, 2:10 PM

Per T91205#1622745, since it's the same patch for both tasks.

• csteipp added a parent task: T108064: MediaWiki Security release 1.25.3.Sep 10 2015, 3:54 PM
• demon awarded a token.Oct 15 2015, 8:58 PM
• csteipp added a subscriber: Grunny.Oct 16 2015, 3:05 PM
• csteipp added a subscriber: ProgramCeltic.Oct 16 2015, 4:09 PM
• csteipp updated the task description. (Show Details)Oct 16 2015, 4:32 PM
• csteipp added a subscriber: Ejegg.Oct 16 2015, 4:38 PM
• demon changed the visibility from "Custom Policy" to "Public (No Login Required)".Oct 16 2015, 6:11 PM
• demon changed the edit policy from "Custom Policy" to "All Users".
Restricted Application changed the visibility from "Public (No Login Required)" to "Custom Policy". · View Herald TranscriptOct 16 2015, 6:11 PM
Restricted Application changed the edit policy from "All Users" to "Custom Policy". · View Herald Transcript
• demon changed the visibility from "Custom Policy" to "Public (No Login Required)".Oct 16 2015, 6:11 PM
• demon changed the edit policy from "Custom Policy" to "All Users".
• demon changed Security from Software security bug to None.
gerritbot subscribed.Oct 16 2015, 6:19 PM

Change 246869 had a related patch set uploaded (by Chad):
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246869

gerritbot added a comment.Oct 16 2015, 6:19 PM

Change 246874 had a related patch set uploaded (by Chad):
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246874

gerritbot added a comment.Oct 16 2015, 6:20 PM

Change 246880 had a related patch set uploaded (by Chad):
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246880

gerritbot added a comment.Oct 16 2015, 6:24 PM

Change 246885 had a related patch set uploaded (by Chad):
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246885

gerritbot added a comment.Oct 16 2015, 7:03 PM

Change 246869 merged by jenkins-bot:
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246869

gerritbot added a comment.Oct 16 2015, 7:49 PM

Change 246880 merged by jenkins-bot:
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246880

gerritbot added a comment.Oct 16 2015, 7:51 PM

Change 246874 merged by jenkins-bot:
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246874

gerritbot added a comment.Oct 16 2015, 8:56 PM

Change 246974 had a related patch set uploaded (by Chad):
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246974

gerritbot added a comment.Oct 16 2015, 9:19 PM

Change 246974 merged by jenkins-bot:
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246974

gerritbot added a comment.Oct 16 2015, 9:45 PM

Change 246885 merged by jenkins-bot:
SECURITY: API: Improve validation in chunked uploading

https://gerrit.wikimedia.org/r/246885

• csteipp updated the task description. (Show Details)Nov 3 2015, 9:07 PM
• ksmith unsubscribed.Nov 3 2015, 9:50 PM
• chasemp added a project: Security.Feb 10 2020, 11:00 PM
• chasemp removed a project: acl*security.Feb 20 2020, 8:18 PM
Aklapper removed a subscriber: Anomie.Oct 16 2020, 5:43 PM
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