CVE-2016-0755

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Summary

CVECVE-2016-0755
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-01-29 20:59:05 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionThe ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which might allow remote attackers to authenticate as other users via a request, a similar issue to CVE-2014-0015.

Risk And Classification

Primary CVSS: v3.0 7.3 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Problem Types: CWE-287 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.3HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 12.04 All All All
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 15.04 All All All
Operating System Canonical Ubuntu Linux 15.10 All All All
Operating System Debian Debian Linux 7.0 All All All
Application Haxx Curl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
[SECURITY] Fedora 23 Update: curl-7.43.0-5.fc23 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
CPU Oct 2018 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
libcurl Lets Remote Users Bypass NTLM Proxy Authentication on the Target System - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
Slackware Security Advisory - curl Updates ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
openSUSE-SU-2016:0373-1: moderate: Security update for curl af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
cURL/libcURL NTLM Connection CVE-2016-0755 Remote Security Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
openSUSE-SU-2016:0376-1: moderate: Security update for curl af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
The Slackware Linux Project: Slackware Security Advisories af854a3a-2127-422b-91ae-364da2661108 www.slackware.com
[SECURITY] Fedora 22 Update: mingw-curl-7.47.0-1.fc22 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
About the security content of macOS Sierra 10.12 - Apple Support af854a3a-2127-422b-91ae-364da2661108 support.apple.com
curl - NTLM credentials not-checked for proxy connection re-use af854a3a-2127-422b-91ae-364da2661108 curl.haxx.se Vendor Advisory
APPLE-SA-2016-09-20 macOS Sierra 10.12 af854a3a-2127-422b-91ae-364da2661108 lists.apple.com
USN-2882-1: curl vulnerability | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
openSUSE-SU-2016:0360-1: moderate: Security update for curl af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Debian -- Security Information -- DSA-3455-1 curl af854a3a-2127-422b-91ae-364da2661108 www.debian.org
cURL: Multiple vulnerabilities (GLSA 201701-47) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
[SECURITY] Fedora 22 Update: curl-7.40.0-8.fc22 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] Fedora 23 Update: mingw-curl-7.47.0-1.fc23 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 690265 Free Berkeley Software Distribution (FreeBSD) Security Update for curl (8b27f1bc-c509-11e5-a95f-b499baebfeaf)
  • 710385 Gentoo Linux cURL Multiple Vulnerabilities (GLSA 201701-47)

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