Bug 1972878 (CVE-2021-34548) - CVE-2021-34548 tor: RELAY_END or RELAY_RESOLVED spoofing
Summary: CVE-2021-34548 tor: RELAY_END or RELAY_RESOLVED spoofing
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-34548
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1972879 1972880
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-06-16 19:39 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-06-16 21:04 UTC (History)
6 users (show)

Fixed In Version:
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Last Closed: 2021-06-16 21:04:38 UTC
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Description Guilherme de Almeida Suckevicz 2021-06-16 19:39:20 UTC 
Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on half-closed streams. Previously, clients failed to validate which
hop sent these cells: this would allow a relay on a circuit to end a stream that wasn't actually built with it. Fixes bug 40389; bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021- 003 and CVE-2021-34548.

References:
https://lists.torproject.org/pipermail/tor-announce/2021-June/000220.html
https://lists.torproject.org/pipermail/tor-announce/2021-June/000221.html
Comment 1 Guilherme de Almeida Suckevicz 2021-06-16 19:40:25 UTC 
Created tor tracking bugs for this issue:

Affects: epel-all [bug 1972880]
Affects: fedora-all [bug 1972879]
Comment 2 Product Security DevOps Team 2021-06-16 21:04:38 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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