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CVE-2009-0654

5.1 · MEDIUM

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors inv…

Published Feb 20, 2009torEPSS 2.37%

Overview

CVE-2009-0654 is a medium-severity vulnerability affecting tor tor. It was published on February 20, 2009 and has a CVSS 2.0 base score of 5.1 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Tor 0.2.0.28, and probably 0.2.0.34 and earlier, allows remote attackers, with control of an entry router and an exit router, to confirm that a sender and receiver are communicating via vectors involving (1) replaying, (2) modifying, (3) inserting, or (4) deleting a single cell, and then observing cell recognition errors at the exit router. NOTE: the vendor disputes the significance of this issue, noting that the product's design "accepted end-to-end correlation as an attack that is too expensive to solve."

Remediation

Check the references section for vendor advisories and patches from tor. Update tor to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
tortor0Affected

References

Refblog.torproject.org/blog/one-cell-enoughRefwww.blackhat.com/html/bh-dc-09/bh-dc-09-archives.html#FuRefwww.blackhat.com/presentations/bh-dc-09/Fu/BlackHat-DC-09-Fu-Break-Tors-Anonymity.pdfRefblog.torproject.org/blog/one-cell-enoughRefwww.blackhat.com/html/bh-dc-09/bh-dc-09-archives.html#FuRefwww.blackhat.com/presentations/bh-dc-09/Fu/BlackHat-DC-09-Fu-Break-Tors-Anonymity.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2009-0654?

CVE-2009-0654 is a medium-severity vulnerability affecting tor tor. It was published on February 20, 2009 and has a CVSS 2.0 base score of 5.1 (MEDIUM).

How severe is CVE-2009-0654?

This vulnerability has a CVSS 2.0 base score of 5.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-0654?

Check the references section for vendor advisories and patches from tor. Update tor to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-0654?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-0654 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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