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CVE-2021-38385

Status Candidate

Overview

Tor before 0.3.5.16, 0.4.5.10, and 0.4.6.7 mishandles the relationship between batch-signature verification and single-signature verification, leading to a remote assertion failure, aka TROVE-2021-007.

Related Files

Gentoo Linux Security Advisory 202305-11
Posted May 3, 2023
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202305-11 - Multiple vulnerabilities have been found in Tor, the worst of which could result in denial of service. Versions less than 0.4.7.13 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2021-38385, CVE-2022-33903, CVE-2023-23589
SHA-256 | b35755744fdd1d6e1ae8281fa91b0190eca10c429f7f73044c5532c64ddd96be
Debian Security Advisory 4961-1
Posted Aug 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4961-1 - Henry de Valence reported a flaw in the signature verification code in Tor, a connection-based low-latency anonymous communication system. A remote attacker can take advantage of this flaw to cause an assertion failure, resulting in denial of service.

tags | advisory, remote, denial of service
systems | linux, debian
advisories | CVE-2021-38385
SHA-256 | d8fd46641386674cf3a52e8f81848a25ad7fddb7438c710b83873a461be4de4c
TOR Virtual Network Tunneling Tool 0.4.6.7
Posted Aug 17, 2021
Authored by Roger Dingledine | Site tor.eff.org

Tor is a network of virtual tunnels that allows people and groups to improve their privacy and security on the Internet. It also enables software developers to create new communication tools with built-in privacy features. It provides the foundation for a range of applications that allow organizations and individuals to share information over public networks without compromising their privacy. Individuals can use it to keep remote Websites from tracking them and their family members. They can also use it to connect to resources such as news sites or instant messaging services that are blocked by their local Internet service providers (ISPs). This is the source code release.

Changes: This version fixes several bugs from earlier versions of Tor, including one that could lead to a denial-of-service attack. Everyone running an earlier version, whether as a client, a relay, or an onion service, should upgrade to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
tags | tool, remote, local, peer2peer
systems | unix
advisories | CVE-2021-38385
SHA-256 | ff665ce121b2952110bd98b9c8741b5593bf6c01ac09033ad848ed92c2510f9a
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