Community Packages

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Tasklist

FS#65313 - [Tor] segmentation fault when malformed request sent on DNSPort

Attached to Project: Community Packages
Opened by Unraw (unraw) - Wednesday, 29 January 2020, 03:31 GMT
Last edited by Christian Rebischke (Shibumi) - Saturday, 22 February 2020, 17:08 GMT
Task Type Bug Report
Category Packages
Status Assigned
Assigned To Lukas Fleischer (lfleischer)
Architecture x86_64
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No

Details

Description:
Tor daemon crash if it receive unexpected data on it's DNSPort.
Tested packages from Archlinux and Manjaro repositories,
latest tor 0.4.3.1-alpha built from sources. Tor daemon from TBB,
Debian repositories and built on Debian are not affected.

Additional info:
* package version(s) = 0.4.2.5-1
* config and/or log files etc.
crashlog:
============================================================ T= 1580267866
Tor 0.4.2.5 died: Caught signal 11
tor(+0x21c9e7)[0x55a97c4199e7]
/usr/lib/libevent-2.1.so.7(+0xc0cc)[0x7f7dbcd9e0cc]
/usr/lib/libevent-2.1.so.7(+0xc0cc)[0x7f7dbcd9e0cc]
/usr/lib/libevent-2.1.so.7(+0x39839)[0x7f7dbcdcb839]
/usr/lib/libevent-2.1.so.7(+0x21e2a)[0x7f7dbcdb3e2a]
/usr/lib/libevent-2.1.so.7(event_base_loop+0x37f)[0x7f7dbcdb44cf]
tor(do_main_loop+0x10c)[0x55a97c26e13c]
tor(tor_run_main+0x122d)[0x55a97c25b10d]
tor(tor_main+0x3b)[0x55a97c2584bb]
tor(main+0x1a)[0x55a97c25805a]
/usr/lib/libc.so.6(__libc_start_main+0xf3)[0x7f7dbc6a3153]
tor(_start+0x2e)[0x55a97c2580be]

Steps to reproduce:
- add option `DNSPort 5353` to torrc and run tor.
- exec `echo -n "asd" | nc -u 127.0.0.1 5353` in a shell.
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