Bug 1995253 (CVE-2021-38385) - CVE-2021-38385 tor: assertion failure in signature verification
Summary: CVE-2021-38385 tor: assertion failure in signature verification
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-38385
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: 1995254 1995255
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-08-18 16:59 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-08-18 21:35 UTC (History)
7 users (show)

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Last Closed: 2021-08-18 21:35:21 UTC
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Description Guilherme de Almeida Suckevicz 2021-08-18 16:59:09 UTC 
Resolve an assertion failure caused by a behavior mismatch between our batch-signature verification code and our single-signature verification code. This assertion failure could be triggered remotely, leading to a denial of service attack. We fix this issue by disabling batch verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is also tracked as TROVE-2021-007 and CVE-2021-38385.

Reference:
https://lists.torproject.org/pipermail/tor-packagers/2021-August/000128.html
Comment 1 Guilherme de Almeida Suckevicz 2021-08-18 16:59:27 UTC 
Created tor tracking bugs for this issue:

Affects: epel-all [bug 1995255]
Affects: fedora-all [bug 1995254]
Comment 2 Product Security DevOps Team 2021-08-18 21:35:21 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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