Vulnerabilities > CVE-2016-8860 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Torproject TOR
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
PARTIAL Summary
Tor before 0.2.8.9 and 0.2.9.x before 0.2.9.4-alpha had internal functions that were entitled to expect that buf_t data had NUL termination, but the implementation of or/buffers.c did not ensure that NUL termination was present, which allows remote attackers to cause a denial of service (client, hidden service, relay, or authority crash) via crafted data.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
NASL family Fedora Local Security Checks NASL id FEDORA_2016-3B6393ACDD.NASL description update to upstream release 0.2.8.9 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-11-03 plugin id 94483 published 2016-11-03 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94483 title Fedora 23 : tor (2016-3b6393acdd) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201612-45.NASL description The remote host is affected by the vulnerability described in GLSA-201612-45 (Tor: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Tor. Please review the CVE identifier and change log referenced below for details. Impact : A remote attacker could possibly cause a Denial of Service condition. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 96125 published 2016-12-27 reporter This script is Copyright (C) 2016-2017 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/96125 title GLSA-201612-45 : Tor: Multiple vulnerabilities NASL family Fedora Local Security Checks NASL id FEDORA_2016-E56ED6F472.NASL description update to upstream release 0.2.8.9 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-11-15 plugin id 94873 published 2016-11-15 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94873 title Fedora 25 : tor (2016-e56ed6f472) NASL family Fedora Local Security Checks NASL id FEDORA_2016-59316CF667.NASL description update to upstream release 0.2.8.9 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2016-11-02 plugin id 94457 published 2016-11-02 reporter This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94457 title Fedora 24 : tor (2016-59316cf667) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3694.NASL description It has been discovered that Tor treats the contents of some buffer chunks as if they were a NUL-terminated string. This issue could enable a remote attacker to crash a Tor client, hidden service, relay, or authority. last seen 2020-06-01 modified 2020-06-02 plugin id 94115 published 2016-10-19 reporter This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94115 title Debian DSA-3694-1 : tor - security update
Packetstorm
| data source | https://packetstormsecurity.com/files/download/143369/orionbrowser79-mitm.txt |
| id | PACKETSTORM:143369 |
| last seen | 2017-07-15 |
| published | 2017-07-14 |
| reporter | MaXe |
| source | https://packetstormsecurity.com/files/143369/Orion-Elite-Hidden-IP-Browser-Pro-7.9-OpenSSL-Tor-Man-In-The-Middle.html |
| title | Orion Elite Hidden IP Browser Pro 7.9 OpenSSL / Tor / Man-In-The-Middle |
References
- http://openwall.com/lists/oss-security/2016/10/19/11
- http://www.debian.org/security/2016/dsa-3694
- http://www.securityfocus.com/bid/95116
- https://blog.torproject.org/blog/tor-0289-released-important-fixes
- https://github.com/torproject/tor/commit/3cea86eb2fbb65949673eb4ba8ebb695c87a57ce
- https://security.gentoo.org/glsa/201612-45
- https://trac.torproject.org/projects/tor/ticket/20384