CVE-2017-1000257

An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer and the size (zero) to the deliver-data function. libcurl's deliver-data function treats zero as a magic number and invokes strlen() on the data to figure out the length. The strlen() is called on a heap based buffer that might not be zero terminated so libcurl might read beyond the end of it into whatever memory lies after (or just crash) and then deliver that to the application as if it was actually downloaded.

CVSS v3.0 9.1 CRITICAL
CVSS v2.0 6.4 MEDIUM

9.1^/10

CVSS v3.0 : CRITICAL

Vector : AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

6.4^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:P/I:N/A:P

Exploitability : 10.0 / Impact : 4.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://curl.haxx.se/docs/adv_20171023.html	Vendor Advisory
http://www.securitytracker.com/id/1039644	Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/101519	Third Party Advisory VDB Entry
http://www.debian.org/security/2017/dsa-4007	Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:3263
https://security.gentoo.org/glsa/201712-04
https://access.redhat.com/errata/RHSA-2018:2486
https://access.redhat.com/errata/RHSA-2018:3558

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Configurations

Configuration 1 (hide)

cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:8.0:::::::*

Information

Published : 2017-10-31 14:29

Updated : 2018-11-13 03:29

NVD link : CVE-2017-1000257

Mitre link : CVE-2017-1000257

JSON object : View

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

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Products Affected

debian

debian_linux

haxx

libcurl

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