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      Last Modified:  10/06/2017      View Analysis Description

Quick Info

CVE Dictionary Entry:
CVE-2017-1000254
Original release date:
10/06/2017
Last revised:
12/25/2017
Source:
US-CERT/NIST

Impact

CVSS Severity (version 3.0):
CVSS v3 Base Score:
7.5 High
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (legend)
Impact Score:
3.6
Exploitability Score:
3.9
CVSS Version 3 Metrics:
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 Severity (version 2.0):
CVSS v2 Base Score:
5.0 MEDIUM
Vector:
(AV:N/AC:L/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore:
2.9
Exploitability Subscore:
10.0
CVSS Version 2 Metrics:
Access Vector:
Network exploitable
Access Complexity:
Low
Authentication:
Not required to exploit
Impact Type:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource Type Source Name
http://www.debian.org/security/2017/dsa-3992 External Source DEBIAN DSA-3992
http://www.securityfocus.com/bid/101115 Third Party Advisory; VDB Entry External Source BID 101115
http://www.securitytracker.com/id/1039509 Third Party Advisory; VDB Entry External Source SECTRACK 1039509
https://curl.haxx.se/673d0cd8.patch Patch; Vendor Advisory External Source CONFIRM https://curl.haxx.se/673d0cd8.patch
https://curl.haxx.se/docs/adv_20171004.html Patch; Vendor Advisory External Source CONFIRM https://curl.haxx.se/docs/adv_20171004.html
https://security.gentoo.org/glsa/201712-04 External Source GENTOO GLSA-201712-04
https://support.apple.com/HT208331 External Source CONFIRM 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.

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Change History 6 change records found - show changes