cURL up to 7.60 SMTP lib/smtp.c Curl_smtp_escape_eob --limit-rate memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in cURL up to 7.60. This impacts the function Curl_smtp_escape_eob in the library lib/smtp.c of the component SMTP Handler. This manipulation of the argument --limit-rate as part of Argument causes memory corruption. The identification of this vulnerability is CVE-2018-0500. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in cURL up to 7.60 (Network Utility Software). Affected by this vulnerability is the function Curl_smtp_escape_eob in the library lib/smtp.c of the component SMTP Handler. The manipulation of the argument --limit-rate as part of a Argument 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 confidentiality, integrity, and availability. The summary by CVE is:

Curl_smtp_escape_eob in lib/smtp.c in curl before 7.61.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

The bug was discovered 07/11/2018. The weakness was shared 07/11/2018 (Website). It is possible to read the advisory at curl.haxx.se. This vulnerability is known as CVE-2018-0500 since 11/27/2017. 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 111405 (FreeBSD : curl -- SMTP send heap buffer overflow (3849e28f-8693-11e8-9610-9c5c8e75236a)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351499 (Amazon Linux Security Advisory for curl: ALAS-2019-1151).

Upgrading to version 7.61.0 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (111405), SecurityFocus (BID 106358†) and SecurityTracker (ID 1041280†). The entries VDB-128431 and VDB-133155 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Network Utility Software

Name

• cURL

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 7.6
• 7.7
• 7.8
• 7.9
• 7.10
• 7.11
• 7.12
• 7.13
• 7.14
• 7.15
• 7.16
• 7.17
• 7.18
• 7.19
• 7.20
• 7.21
• 7.22
• 7.23
• 7.24
• 7.25
• 7.26
• 7.27
• 7.28
• 7.29
• 7.30
• 7.31
• 7.32
• 7.33
• 7.34
• 7.35
• 7.36
• 7.37
• 7.38
• 7.39
• 7.40
• 7.41
• 7.42
• 7.43
• 7.44
• 7.45
• 7.46
• 7.47
• 7.48
• 7.49
• 7.50
• 7.51
• 7.52
• 7.53
• 7.54
• 7.55
• 7.56
• 7.57
• 7.58
• 7.59
• 7.60

License

• open-source

Website

• Product: https://github.com/curl/curl/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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: 🔍

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: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 111405
Nessus Name: FreeBSD : curl -- SMTP send heap buffer overflow (3849e28f-8693-11e8-9610-9c5c8e75236a)
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: 🔍
Exposure Time: 🔍

Upgrade: cURL 7.61.0
Patch: github.com

Timelineinfo

11/27/2017 🔍
07/11/2018 +225 days 🔍
07/11/2018 +0 days 🔍
07/11/2018 +0 days 🔍
07/12/2018 +1 days 🔍
07/12/2018 +0 days 🔍
07/27/2018 +15 days 🔍
07/30/2018 +3 days 🔍
12/26/2018 +149 days 🔍
04/06/2023 +1562 days 🔍

Sourcesinfo

Product: github.com

Advisory: RHSA-2018:2486
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0500 (🔍)
GCVE (CVE): GCVE-0-2018-0500
GCVE (VulDB): GCVE-100-121339
SecurityFocus: 106358 - GNU wget CVE-2018-20483 Local Information Disclosure Vulnerability
SecurityTracker: 1041280

See also: 🔍

Entryinfo

Created: 07/12/2018 10:01
Updated: 04/06/2023 19:38
Changes: 07/12/2018 10:01 (82), 03/05/2020 09:16 (5), 04/06/2023 19:38 (5)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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