cURL 7.54.1 file:/ file.c file_do buf Memory information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in cURL 7.54.1. Affected by this issue is the function file_do of the file file.c of the component file:/ Handler. The manipulation of the argument buf results in information disclosure (Memory). This vulnerability is reported as CVE-2017-1000099. The attack requires a local approach. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in cURL 7.54.1 (Network Utility Software). Affected is the function file_do of the file file.c of the component file:/ Handler. The manipulation of the argument buf with an unknown input leads to a information disclosure vulnerability (Memory). CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality.

The bug was discovered 07/15/2017. The weakness was disclosed 08/09/2017 as adv_20170809C as confirmed advisory (Website). The advisory is available at curl.haxx.se. This vulnerability is traded as CVE-2017-1000099 since 10/03/2017. Local access is required to approach this attack. A authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project. The reason for this vulnerability is this part of code: 

result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);

The vulnerability was handled as a non-public zero-day exploit for at least 25 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 102877 (Amazon Linux AMI : curl (ALAS-2017-889)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276813 (Fedora Security Update for curl (FEDORA-2017-f2df9d7772)).

Upgrading to version 7.54.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at curl.haxx.se. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

result = Curl_client_write(conn, CLIENTWRITE_BOTH, header, 0);

The vulnerability is also documented in the databases at Tenable (102877), SecurityFocus (BID 100281†) and SecurityTracker (ID 1039119†). The entries VDB-105283, VDB-105284 and VDB-108948 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Memory
Class: Information disclosure / Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 102877
Nessus Name: Amazon Linux AMI : curl (ALAS-2017-889)
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: cURL 7.54.1
Patch: curl.haxx.se

Timelineinfo

07/15/2017 🔍
08/09/2017 +25 days 🔍
08/09/2017 +0 days 🔍
08/09/2017 +0 days 🔍
08/10/2017 +1 days 🔍
08/13/2017 +3 days 🔍
09/01/2017 +19 days 🔍
10/03/2017 +32 days 🔍
10/04/2017 +1 days 🔍
01/09/2021 +1193 days 🔍

Sourcesinfo

Advisory: adv_20170809C
Researcher: Even Rouault.
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-1000099 (🔍)
GCVE (CVE): GCVE-0-2017-1000099
GCVE (VulDB): GCVE-100-105282
SecurityFocus: 100281 - Curl CVE-2017-1000099 Local Information Disclosure Vulnerability
SecurityTracker: 1039119

See also: 🔍

Entryinfo

Created: 08/13/2017 19:26
Updated: 01/09/2021 11:35
Changes: 08/13/2017 19:26 (83), 11/06/2019 17:52 (5), 01/09/2021 11:33 (2), 01/09/2021 11:35 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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