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CVE-2021-34549

Good to know:

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Date: June 29, 2021

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.

Language: C

Severity Score

Related Resources (9)

https://gitlab.torproject.org/tpo/core/tor/-/commit/4c06c619faceb5d158a725d97fda45cadb2cf9c9
https://gitlab.torproject.org/tpo/core/tor/-/issues/40391
https://security.gentoo.org/glsa/202107-25
https://blog.torproject.org/node/2041
https://security.alpinelinux.org/vuln/CVE-2021-34549
https://security-tracker.debian.org/tracker/CVE-2021-34549
https://nvd.nist.gov/vuln/detail/CVE-2021-34549
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-34549
https://www.mend.io/vulnerability-database/CVE-2021-34549

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption ('Resource Exhaustion')

CWE-400

Improper Handling of Exceptional Conditions

CWE-755

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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