PT-2021-22099 · Tor+4 · Tor+4
Hdevalence
+1
·
Published
2021-08-17
·
Updated
2025-05-12
·
CVE-2021-38385
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Tor versions prior to 0.3.5.16
Tor versions prior to 0.4.5.10
Tor versions prior to 0.4.6.7
Description
The issue is related to how Tor handles the relationship between batch-signature verification and single-signature verification, leading to a remote assertion failure. This can be used to initiate a denial of service. The problem occurs due to a discrepancy in the behavior of code for verifying digital signatures individually and in batch mode.
Recommendations
For versions prior to 0.3.5.16, update to version 0.3.5.16 or later.
For versions prior to 0.4.5.10, update to version 0.4.5.10 or later.
For versions prior to 0.4.6.7, update to version 0.4.6.7 or later.
Exploit
Fix
Assertion Failure
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Linuxmint
Suse
Tor
Ubuntu