cURL up to 7.54.1 TFTP URL tftp.c tftp_send_first filename Memory information disclosure
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.1 | $0-$5k | 0.00 |
A vulnerability classified as problematic was found in cURL up to 7.54.1 (Network Utility Software). Affected by this vulnerability is the function tftp_send_first
of the file tftp.c of the component TFTP URL Handler. The manipulation of the argument filename
with an unknown input leads to a information disclosure vulnerability (Memory). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality.
The bug was discovered 07/11/2017. The weakness was presented 08/09/2017 as adv_20170809B as confirmed advisory (Website). It is possible to read the advisory at curl.haxx.se. This vulnerability is known as CVE-2017-1000100 since 10/03/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.
The vulnerability was handled as a non-public zero-day exploit for at least 29 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 351077 (Amazon Linux Security Advisory for curl: ALAS-2017-889).
Upgrading to version 7.55.0 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:
if(strlen(filename) > (state->blksize - strlen(mode) - 4)) { failf(data, "TFTP file name too long\n"); return CURLE_TFTP_ILLEGAL; /* too long file name field */ }
The vulnerability is also documented in the vulnerability database at Tenable (102877). See 105282, 105284 and 108947 for similar entries.
Product
Type
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.4VulDB Meta Temp Score: 5.3
VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 6.5
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Name: MemoryClass: Information disclosure / Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Nessus ID: 102877
Nessus Name: Amazon Linux AMI : curl (ALAS-2017-889)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 53378
OpenVAS Name: Debian Security Advisory DSA 3992-1 (curl - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: cURL 7.55.0
Patch: curl.haxx.se
Timeline
07/11/2017 🔍08/09/2017 🔍
08/09/2017 🔍
08/09/2017 🔍
08/10/2017 🔍
08/13/2017 🔍
09/01/2017 🔍
10/03/2017 🔍
10/04/2017 🔍
01/09/2021 🔍
Sources
Advisory: adv_20170809BResearcher: Even Rouault.
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2017-1000100 (🔍)
OVAL: 🔍
SecurityTracker: 1039118
SecurityFocus: 100286 - cURL/libcURL CVE-2017-1000100 Heap Based Buffer Overflow Vulnerability
See also: 🔍
Entry
Created: 08/13/2017 19:28Updated: 01/09/2021 11:44
Changes: 08/13/2017 19:28 (86), 11/06/2019 17:59 (5), 01/09/2021 11:41 (2), 01/09/2021 11:44 (1)
Complete: 🔍
Cache ID: 3:6B8:103
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