Arch Linux Security Advisory ASA-201706-13

Severity: Medium
Date : 2017-06-13
CVE-ID : CVE-2017-0375 CVE-2017-0376
Package : tor
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-296

Summary

The package tor before version 0.3.0.8-1 is vulnerable to denial of
service.

Resolution

Upgrade to 0.3.0.8-1.

pacman -Syu “tor>=0.3.0.8-1”

The problems have been fixed upstream in version 0.3.0.8.

Workaround

None.

Description

• CVE-2017-0375 (denial of service)

The hidden-service feature in Tor before 0.3.0.8 allows a denial of
service (assertion failure and daemon exit) in the
relay_send_end_cell_from_edge_ function via a malformed BEGIN cell.

• CVE-2017-0376 (denial of service)

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.

Impact

A remote attacker is able to send specially crafted input to the
hidden-service feature of tor to crash the application.

References

https://bugs.archlinux.org/task/54439
https://lists.torproject.org/pipermail/tor-announce/2017-June/000131.html
https://trac.torproject.org/projects/tor/ticket/22493
https://github.com/torproject/tor/commit/79b59a2dfcb68897ee89d98587d09e55f07e68d7
https://trac.torproject.org/projects/tor/ticket/22494
https://github.com/torproject/tor/commit/56a7c5bc15e0447203a491c1ee37de9939ad1dcd
https://security.archlinux.org/CVE-2017-0375
https://security.archlinux.org/CVE-2017-0376