Tor up to 0.2.8.8/0.2.9.3 or/buffers.c memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Tor up to 0.2.8.8/0.2.9.3 and classified as problematic. The affected element is an unknown function of the file or/buffers.c. This manipulation causes memory corruption. This vulnerability is registered as CVE-2016-8860. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Tor up to 0.2.8.8/0.2.9.3 (Network Encryption Software) and classified as problematic. Affected by this vulnerability is an unknown part of the file or/buffers.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. The summary by CVE is:

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.

The bug was discovered 12/19/2016. The weakness was published 01/04/2017 (Website). It is possible to read the advisory at openwall.com. This vulnerability is known as CVE-2016-8860 since 10/19/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 94483 (Fedora 23 : tor (2016-3b6393acdd)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276276 (Fedora Security Update for tor (FEDORA-2016-e56ed6f472)).

Upgrading to version 0.2.8.9 or 0.2.9.4-alpha eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (94483) and SecurityFocus (BID 95116†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 94483
Nessus Name: Fedora 23 : tor (2016-3b6393acdd)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 850102
OpenVAS Name: Fedora Update for tor FEDORA-2016-e56ed6f472
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Tor 0.2.8.9/0.2.9.4-alpha
Patch: github.com

Timelineinfo

10/19/2016 🔍
11/01/2016 +13 days 🔍
11/03/2016 +2 days 🔍
12/19/2016 +46 days 🔍
12/19/2016 +0 days 🔍
01/04/2017 +16 days 🔍
01/04/2017 +0 days 🔍
01/05/2017 +1 days 🔍
09/17/2024 +2812 days 🔍

Sourcesinfo

Advisory: FEDORA-2016-3b6393acdd
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-8860 (🔍)
GCVE (CVE): GCVE-0-2016-8860
GCVE (VulDB): GCVE-100-95035

OVAL: 🔍

SecurityFocus: 95116 - Tor CVE-2016-8860 Remote Denial of Service Vulnerability
OSVDB: - CVE-2016-8860 - Tor - Denial of Service Issue

Entryinfo

Created: 01/05/2017 12:57
Updated: 09/17/2024 16:08
Changes: 01/05/2017 12:57 (68), 07/14/2020 17:13 (9), 10/27/2022 15:31 (5), 10/27/2022 15:37 (1), 09/17/2024 16:08 (16)
Complete: 🔍
Cache ID: 216:255:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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