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CVE-2021-34548

Good to know:

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Date: June 29, 2021

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.

Language: C

Severity Score

Related Resources (10)

https://people.canonical.com/~ubuntu-security/cve/CVE-2021-34548
https://gitlab.torproject.org/tpo/core/tor/-/commit/adb248b6d6e0779719e6b873ee12a1e22fa390f4
https://security.gentoo.org/glsa/202107-25
https://blog.torproject.org/node/2041
http://packetstormsecurity.com/files/163510/Tor-Half-Closed-Connection-Stream-Confusion.html
https://security.alpinelinux.org/vuln/CVE-2021-34548
https://security-tracker.debian.org/tracker/CVE-2021-34548
https://nvd.nist.gov/vuln/detail/CVE-2021-34548
https://gitlab.torproject.org/tpo/core/tor/-/issues/40389
https://www.mend.io/vulnerability-database/CVE-2021-34548

Severity Score

Weakness Type (CWE)

Authentication Bypass by Spoofing

CWE-290

Incorrect Authorization

CWE-863

Top Fix

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Upgrade Version

Upgrade to version tor-0.3.5.15, tor-0.4.4.9, tor-0.4.5.9, tor-0.4.6.5

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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