Tor up to 0.3.0.7 Hidden-Service relay_send_end_cell_from_edge BEGIN Cell input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Tor up to 0.3.0.7. The impacted element is the function relay_send_end_cell_from_edge of the component Hidden-Service. The manipulation as part of BEGIN Cell leads to input validation. This vulnerability is uniquely identified as CVE-2017-0375. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Tor up to 0.3.0.7 (Network Encryption Software). This issue affects the function relay_send_end_cell_from_edge of the component Hidden-Service. The manipulation as part of a BEGIN Cell leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

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.

The bug was discovered 06/05/2017. The weakness was disclosed 06/09/2017 (GitHub Repository). The advisory is shared at github.com. The identification of this vulnerability is CVE-2017-0375 since 11/29/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 100831 (openSUSE Security Update : tor (openSUSE-2017-690)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170101 (OpenSUSE Security Update for tor (openSUSE-SU-2017:1569-1)).

Upgrading to version 0.3.0.8 eliminates this vulnerability. A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100831) and SecurityFocus (BID 99017†). The entry VDB-102198 is pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
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: Input validation
CWE: CWE-20
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: 100831
Nessus Name: openSUSE Security Update : tor (openSUSE-2017-690)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Tor 0.3.0.8
Patch: github.com

Timelineinfo

11/29/2016 🔍
06/05/2017 +188 days 🔍
06/05/2017 +0 days 🔍
06/09/2017 +4 days 🔍
06/09/2017 +0 days 🔍
06/10/2017 +1 days 🔍
06/15/2017 +5 days 🔍
06/16/2017 +1 days 🔍
12/08/2022 +2001 days 🔍

Sourcesinfo

Advisory: 79b59a2dfcb68897ee89d98587d09e55f07e68d7
Researcher: Roger Dingledine
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-0375 (🔍)
GCVE (CVE): GCVE-0-2017-0375
GCVE (VulDB): GCVE-100-102197
SecurityFocus: 99017 - Tor CVE-2017-0375 Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 06/10/2017 08:57
Updated: 12/08/2022 10:55
Changes: 06/10/2017 08:57 (74), 10/15/2019 20:22 (5), 12/26/2020 19:05 (3), 12/08/2022 10:55 (4)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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