Bug 1972885 (CVE-2021-34550) - CVE-2021-34550 tor: out-of-bounds memory access in v3 onion service descriptor parsing
Summary: CVE-2021-34550 tor: out-of-bounds memory access in v3 onion service descripto...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-34550
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: 1972886 1972887
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-06-16 19:44 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-06-16 21:05 UTC (History)
6 users (show)

Fixed In Version:
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Last Closed: 2021-06-16 21:05:01 UTC
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Description Guilherme de Almeida Suckevicz 2021-06-16 19:44:37 UTC 
Fix an out-of-bounds memory access in v3 onion service descriptor parsing. An attacker could exploit this bug by crafting an onion service descriptor that would crash any client that tried to visit it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei Glazunov from Google's Project Zero.

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 19:45:59 UTC 
Created tor tracking bugs for this issue:

Affects: epel-all [bug 1972887]
Affects: fedora-all [bug 1972886]
Comment 2 Product Security DevOps Team 2021-06-16 21:05:01 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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