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CVE-2021-34548

Status Candidate

Overview

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003. An attacker can forge RELAY_END or RELAY_RESOLVED to bypass the intended access control for ending a stream.

Related Files

Tor Half-Closed Connection Stream Confusion
Posted Jul 15, 2021
Authored by Jann Horn, Google Security Research

Tor suffers from an issue where half-closed connection tracking ignores layer_hint and due to this, entry/middle relays can spoof RELAY_END cells on half-closed streams, which can lead to stream confusion between OP and exit.

tags | exploit, spoof
advisories | CVE-2021-34548
SHA-256 | 0544acc1f8cb71eaae260f7d2c03e6b0c3ebabe6b8549cd83018b8757f7db64a
Gentoo Linux Security Advisory 202107-25
Posted Jul 12, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202107-25 - Multiple vulnerabilities have been found in Tor, the worst of which could result in a Denial of Service condition. Versions less than 0.4.6.5 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2021-28089, CVE-2021-28090, CVE-2021-34548, CVE-2021-34549, CVE-2021-34550
SHA-256 | 7692df39f84fe213dae815465dde76f6045ee1bf33730aeb443dbfd43e98494e
TOR Virtual Network Tunneling Tool 0.4.6.5
Posted Jun 14, 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: Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x series includes numerous features and bugfixes, including a significant improvement to the circuit timeout algorithm that should improve observed client performance, and a way for relays to report when they are overloaded. This release also includes security fixes for several security issues, including a denial-of-service attack against onion service clients, and another denial-of-service attack against relays. Everybody should upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
tags | tool, remote, local, peer2peer
systems | unix
advisories | CVE-2021-34548, CVE-2021-34550
SHA-256 | 7b6d354e0d9791eace4b51e92211909308297b7aa257993937163d7ee0694cf9
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