National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-1000254 Detail

Current Description

libcurl may read outside of a heap allocated buffer when doing FTP. When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote.

Source:  MITRE
Description Last Modified:  10/06/2017
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


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

CVSS v2.0 Severity and Metrics:

Base Score: 5.0 MEDIUM
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

Hyperlink Resource
http://www.debian.org/security/2017/dsa-3992
http://www.securityfocus.com/bid/101115 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039509 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:2486
https://access.redhat.com/errata/RHSA-2018:3558
https://curl.haxx.se/673d0cd8.patch Patch Vendor Advisory
https://curl.haxx.se/docs/adv_20171004.html Patch Vendor Advisory
https://security.gentoo.org/glsa/201712-04
https://support.apple.com/HT208331

Technical Details

Vulnerability Type (View All)

Vulnerable software and versions Switch to CPE 2.2

Configuration 1
OR
cpe:2.3:a:haxx:libcurl:7.7:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.7.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.7.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.7.3:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.8:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.8.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.3:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.4:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.5:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.6:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.7:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.9.8:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.3:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.4:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.5:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.6:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.7:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.10.8:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.11.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.11.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.11.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.12.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.12.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.12.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.12.3:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.13.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.13.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.13.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.14.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.14.1:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.16.4:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.17.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.17.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.18.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.18.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.18.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.3:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.4:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.5:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.6:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.19.7:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.20.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.20.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.2:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.3:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.4:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.5:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.6:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.21.7:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.22.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.23.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.23.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.24.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.25.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.26.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.27.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.28.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.28.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.29.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.30.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.31.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.32.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.33.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.34.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.35.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.36.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.37.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.37.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.38.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.39:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.40.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.41.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.42.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.42.1:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.43.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.44.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.45.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.46.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.47.0:*:*:*:*:*:*:*
cpe:2.3:a:haxx:libcurl:7.47.1:*:*:*:*:*:*:*
Showing 100 of 117 CPEs, view all CPEs here.

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

Change History

8 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-1000254
NVD Published Date:
10/06/2017
NVD Last Modified:
11/13/2018