Bug 188428 - MITM attacks against portsnap(8)
Summary: MITM attacks against portsnap(8)
Status: Closed Overcome By Events
Alias: None
Product: Base System
Classification: Unclassified
Component: bin (show other bugs)
Version: Unspecified
Hardware: Any Any
: Normal Affects Many People
Assignee: Colin Percival
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-04-10 17:20 UTC by David
Modified: 2025-01-21 16:28 UTC (History)
1 user (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description David 2014-04-10 17:20:00 UTC 
Portsnap extracts fetched data prior to its SHA256 verification. The extraction libraries used have a long history of bugs so its reasonable to assume there might be more. Portsnap runs as root. Using a vulnerability in the decompression libraries an attacker who was MITM-capable could compromise any FreeBSD system running portsnap.

Fix: 

Solution summary: a re-working of the snapshot hashing and hash verification process.

The functions of concern in portsnap.sh are fetch_snapshot(), fetch_update(), and fetch_snapshot_verify().
Comment 1 Mark Linimon freebsd_committer freebsd_triage 2014-04-14 00:37:33 UTC 
Responsible Changed
From-To: freebsd-bugs->cperciva

Over to maintainer.
Comment 2 Eitan Adler freebsd_committer freebsd_triage 2018-05-28 19:50:29 UTC 
batch change:

For bugs that match the following
-  Status Is In progress 
AND
- Untouched since 2018-01-01.
AND
- Affects Base System OR Documentation

DO:

Reset to open status.


Note:
I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.
Comment 3 Mark Linimon freebsd_committer freebsd_triage 2025-01-21 16:28:37 UTC 
^Triage: portsnap was disconnected from the build 20230420.