NVD - CVE-2017-1000100

CVE-2017-1000100 Detail

Modified

This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.

Current Description

When doing a TFTP transfer and curl/libcurl is given a URL that contains a very long file name (longer than about 515 bytes), the file name is truncated to fit within the buffer boundaries, but the buffer size is still wrongly updated to use the untruncated length. This too large value is then used in the sendto() call, making curl attempt to send more data than what is actually put into the buffer. The endto() function will then read beyond the end of the heap based buffer. A malicious HTTP(S) server could redirect a vulnerable libcurl-using client to a crafted TFTP URL (if the client hasn't restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curl's redirect protocols with --proto-redir and libcurl's with CURLOPT_REDIR_PROTOCOLS.

Source: MITRE
Description Last Modified: 10/04/2017
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N (V3 legend)
Impact Score: 3.6
Exploitability Score: 2.8

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 4.3 MEDIUM
Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.6

Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): None
Availability (A): None
Additional Information:
Victim must voluntarily interact with attack mechanism
Allows unauthorized disclosure of information

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
http://www.debian.org/security/2017/dsa-3992
http://www.securityfocus.com/bid/100286	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039118	Third Party Advisory VDB Entry
https://curl.haxx.se/docs/adv_20170809B.html	Patch Vendor Advisory
https://security.gentoo.org/glsa/201709-14	Patch Third Party Advisory VDB Entry
https://support.apple.com/HT208221

Technical Details

Vulnerability Type (View All)

Information Leak / Disclosure (CWE-200)

Vulnerable software and versions Switch to CPE 2.2

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

3 change records found - show changes

Initial Analysis - 11/1/2017 3:11:35 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 3950 characters. View Entire Change Record OR cpe:2.3:a:haxx:libcurl:7.15.0::::::: cpe:2.3:a:haxx:libcurl:7.15.1::::::: cpe:2.3:a:haxx:libcurl:7.15.2::::::: cpe:2.3:a:haxx:libcurl:7.15.3::::::: cpe:2.3:a:haxx:libcurl:7.15.4::::::: cpe:2.3:a:haxx:libcurl:7.15.5::::::: cpe:2.3:a:haxx:libcurl:7.16.0::::::: cpe:2.3:a:haxx:libcurl:7.16.1::::::: cpe:2.3:a:haxx:libcurl:7.16.2::::::: cpe:2.3:a:haxx:libcurl:7.16.3::::::*
Added	CVSS V2		(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Added	CVSS V3		AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Added	CWE		CWE-200
Changed	Reference Type	http://www.securityfocus.com/bid/100286 No Types Assigned	http://www.securityfocus.com/bid/100286 Third Party Advisory, VDB Entry
Changed	Reference Type	http://www.securitytracker.com/id/1039118 No Types Assigned	http://www.securitytracker.com/id/1039118 Third Party Advisory, VDB Entry
Changed	Reference Type	https://curl.haxx.se/docs/adv_20170809B.html No Types Assigned	https://curl.haxx.se/docs/adv_20170809B.html Patch, Vendor Advisory
Changed	Reference Type	https://security.gentoo.org/glsa/201709-14 No Types Assigned	https://security.gentoo.org/glsa/201709-14 Patch, Third Party Advisory, VDB Entry

Quick Info

CVE Dictionary Entry:
CVE-2017-1000100
NVD Published Date:
10/04/2017
NVD Last Modified:
11/13/2017

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-1000100 Detail

Current Description

Analysis Description