Vulnerabilities > CVE-2016-8860 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Torproject TOR

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
torproject
CWE-119
nessus
NVD
Published: 2017-01-04
Updated: 2017-07-01

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

Part Description Count
Application
Torproject
351

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 familyFedora Local Security Checks
    NASL idFEDORA_2016-3B6393ACDD.NASL
    descriptionupdate 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 seen2020-06-05
    modified2016-11-03
    plugin id94483
    published2016-11-03
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/94483
    titleFedora 23 : tor (2016-3b6393acdd)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201612-45.NASL
    descriptionThe 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 seen2020-06-01
    modified2020-06-02
    plugin id96125
    published2016-12-27
    reporterThis script is Copyright (C) 2016-2017 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/96125
    titleGLSA-201612-45 : Tor: Multiple vulnerabilities
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-E56ED6F472.NASL
    descriptionupdate 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 seen2020-06-05
    modified2016-11-15
    plugin id94873
    published2016-11-15
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/94873
    titleFedora 25 : tor (2016-e56ed6f472)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2016-59316CF667.NASL
    descriptionupdate 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 seen2020-06-05
    modified2016-11-02
    plugin id94457
    published2016-11-02
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/94457
    titleFedora 24 : tor (2016-59316cf667)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3694.NASL
    descriptionIt 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 seen2020-06-01
    modified2020-06-02
    plugin id94115
    published2016-10-19
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/94115
    titleDebian DSA-3694-1 : tor - security update

Packetstorm

data sourcehttps://packetstormsecurity.com/files/download/143369/orionbrowser79-mitm.txt
idPACKETSTORM:143369
last seen2017-07-15
published2017-07-14
reporterMaXe
sourcehttps://packetstormsecurity.com/files/143369/Orion-Elite-Hidden-IP-Browser-Pro-7.9-OpenSSL-Tor-Man-In-The-Middle.html
titleOrion Elite Hidden IP Browser Pro 7.9 OpenSSL / Tor / Man-In-The-Middle

References