CVE-2017-0376 - Reachable Assertion

Severity

50%

Complexity

99%

Confidentiality

48%

The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the connection_edge_process_relay_cell function via a BEGIN_DIR cell on a rendezvous circuit.

The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the connection_edge_process_relay_cell function via a BEGIN_DIR cell on a rendezvous circuit.

CVSS 3.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P).

Demo Examples

Reachable Assertion

CWE-617

In the excerpt below, an AssertionError (an unchecked exception) is thrown if the user hasn't entered an email address in an HTML form.


               
assert email != null;

Overview

First reported 7 years ago

2017-06-09 17:29:00

Last updated 5 years ago

2019-10-03 00:03:00

Affected Software

Torproject Tor

Debian Linux 8.0 (Jessie)

8.0

Debian Linux 9.0

9.0

References

DSA-3877

Third Party Advisory

https://github.com/torproject/tor/commit/56a7c5bc15e0447203a491c1ee37de9939ad1dcd

Issue Tracking, Patch, Third Party Advisory

https://lists.torproject.org/pipermail/tor-announce/2017-June/000131.html

Mailing List, Third Party Advisory

https://trac.torproject.org/projects/tor/ticket/22494

Issue Tracking, Third Party Advisory

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