CVE-2009-2426: Medium severity tor (the onion router) vulnerability

Published Jul 10, 2009
·
Updated

The connectionedgeprocessrelaycellnotopen function in src/or/relay.c in Tor 0.2.x before 0.2.0.35 and 0.1.x before 0.1.2.8-beta allows exit relays to have an unspecified impact by causing controllers to accept DNS responses that redirect to an internal IP address via unknown vectors. NOTE: some of these details are obtained from third party information.

Affected Software

95 affected components
Tor (The Onion Router)=0.1.1.1_alpha
Tor (The Onion Router)=0.1.1.6
Tor (The Onion Router)=0.1.1.9
Tor (The Onion Router)=0.1.2.1_alpha-cvs
Tor (The Onion Router)=0.1.0.18
Tor (The Onion Router)=0.1.1.23
Tor (The Onion Router)=0.2.0.11-alpha
Tor (The Onion Router)=0.1.0.7
Tor (The Onion Router)=0.1.1.19
Tor (The Onion Router)=0.2.0.22-alpha
Tor (The Onion Router)=0.2.0.19-alpha
Tor (The Onion Router)=0.1.0.10
Tor (The Onion Router)=0.2.0.31-alpha
Tor (The Onion Router)=0.2.0.14-alpha
Tor (The Onion Router)=0.1.0.8
Tor (The Onion Router)=0.2.0.28-alpha
Tor (The Onion Router)=0.1.0.12
Tor (The Onion Router)=0.1.2.5
Tor (The Onion Router)=0.1.1.26
Tor (The Onion Router)=0.2.0.17-alpha
Tor (The Onion Router)=0.2.0.25-alpha
Tor (The Onion Router)=0.1.1.3_alpha
Tor (The Onion Router)=0.1.1.17
Tor (The Onion Router)=0.1.0.5
Tor (The Onion Router)=0.1.0.2
Tor (The Onion Router)=0.1.0.1
Tor (The Onion Router)=0.2.0.26-alpha
Tor (The Onion Router)=0.2.0.12-alpha
Tor (The Onion Router)=0.1.1.2
Tor (The Onion Router)=0.2.0.3-alpha
Tor (The Onion Router)=0.1.2.6-alpha
Tor (The Onion Router)=0.2.0.7-alpha
Tor (The Onion Router)=0.1.1.8
Tor (The Onion Router)=0.2.0.18-alpha
Tor (The Onion Router)=0.1.1.5
Tor (The Onion Router)=0.2.0.4-alpha
Tor (The Onion Router)=0.1.0.13
Tor (The Onion Router)=0.1.0.19
Tor (The Onion Router)=0.2.0.27-alpha
Tor (The Onion Router)=0.1.0.3
Tor (The Onion Router)=0.1.1.10_alpha
Tor (The Onion Router)=0.1.0.14
Tor (The Onion Router)=0.1.1.12
Tor (The Onion Router)=0.1.1.16
Tor (The Onion Router)=0.2.0.15-alpha
Tor (The Onion Router)=0.2.0.9-alpha
Tor (The Onion Router)=0.1.1.18
Tor (The Onion Router)=0.1.1.15
Tor (The Onion Router)=0.2.0.2-alpha
Tor (The Onion Router)=0.1.1.4_alpha
Tor (The Onion Router)=0.1.1.21
Tor (The Onion Router)=0.1.2.4
Tor (The Onion Router)=0.2.0.8-alpha
Tor (The Onion Router)=0.1.0.15
Tor (The Onion Router)=0.1.2.7-alpha
Tor (The Onion Router)=0.1.1.14
Tor (The Onion Router)=0.2.0.24-alpha
Tor (The Onion Router)=0.1.2.3-alpha
Tor (The Onion Router)=0.1.0.6
Tor (The Onion Router)=0.2.0.33
Tor (The Onion Router)=0.2.0.34-alpha
Tor (The Onion Router)=0.1.1.3
Tor (The Onion Router)=0.1.1.7_alpha
Tor (The Onion Router)=0.2.0.21-alpha
Tor (The Onion Router)=0.1.1.6_alpha
Tor (The Onion Router)=0.1.0.9
Tor (The Onion Router)=0.1.1
Tor (The Onion Router)=0.1.1.22
Tor (The Onion Router)=0.1.2.2
Tor (The Onion Router)=0.1.1.2_alpha
Tor (The Onion Router)=0.1.1.1
Tor (The Onion Router)=0.1.0.16
Tor (The Onion Router)=0.2.0.20-alpha
Tor (The Onion Router)=0.1.1.10
Tor (The Onion Router)=0.2.0.13-alpha
Tor (The Onion Router)=0.2.0.1-alpha
Tor (The Onion Router)=0.1.1.20
Tor (The Onion Router)=0.2.0.23-alpha
Tor (The Onion Router)=0.1.0.17
Tor (The Onion Router)=0.1.1.7
Tor (The Onion Router)=0.2.0.10-alpha
Tor (The Onion Router)=0.1.1.25
Tor (The Onion Router)=0.1.0.4
Tor (The Onion Router)=0.1.1.13
Tor (The Onion Router)=0.1.1.8_alpha
Tor (The Onion Router)=0.1.1.9_alpha
Tor (The Onion Router)=0.1.1.5_alpha
Tor (The Onion Router)=0.1.0.11
Tor (The Onion Router)=0.1.1.11
Tor (The Onion Router)=0.2.0.29-alpha
Tor (The Onion Router)=0.1.2.5-alpha
Tor (The Onion Router)=0.2.0.6-alpha
Tor (The Onion Router)=0.2.0.16-alpha
Tor (The Onion Router)=0.1.1.4
Tor (The Onion Router)=0.2.0.5-alpha

Remediation

Patch Available

http://archives.seul.org/or/announce/Jun-2009/msg00000.html

Patch Available

http://www.osvdb.org/55341

Patch Available

http://www.securityfocus.com/bid/35505

Patch Available

http://www.vupen.com/english/advisories/2009/1716

Event History

Jul 10, 2009
CVE Published
via MITRE·05:00 PM
Data Sourced
via MITRE·05:00 PM
Description

Frequently Asked Questions

1

What is the severity of CVE-2009-2426?

CVE-2009-2426 has not been assigned a specific severity rating but is known to pose risks related to the acceptance of malicious DNS responses.

2

How do I fix CVE-2009-2426?

To address CVE-2009-2426, upgrade your Tor software to version 0.2.0.35 or later.

3

What versions of Tor are affected by CVE-2009-2426?

CVE-2009-2426 affects Tor versions 0.2.x before 0.2.0.35 and 0.1.x before 0.1.2.8-beta.

4

What impact does CVE-2009-2426 have on Tor users?

CVE-2009-2426 allows exit relays to potentially redirect users to internal IP addresses through manipulated DNS responses.

5

Is there any workaround for CVE-2009-2426 if I can't upgrade?

There are no known effective workarounds for CVE-2009-2426, so upgrading is strongly recommended.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203