Improper Authentication in curl.haxx.se cURL

1) Improper Authentication

EUVDB-ID: #VU33077

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-0755

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The 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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

cURL: 7.1 - 7.46.0

CPE2.3

• cpe:2.3:a:curl_haxx_se:curl:7.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl_haxx_se:curl:7.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl_haxx_se:curl:7.2:*:*:*:*:*:*:*

External links

https://curl.haxx.se/docs/adv_20160127A.html
https://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/176546.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/177342.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/177383.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-January/176413.html
https://lists.opensuse.org/opensuse-updates/2016-02/msg00031.html
https://lists.opensuse.org/opensuse-updates/2016-02/msg00044.html
https://lists.opensuse.org/opensuse-updates/2016-02/msg00047.html
https://packetstormsecurity.com/files/135695/Slackware-Security-Advisory-curl-Updates.html
https://www.debian.org/security/2016/dsa-3455
https://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
https://www.securityfocus.com/bid/82307
https://www.securitytracker.com/id/1034882
https://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.519965
https://www.ubuntu.com/usn/USN-2882-1
https://security.gentoo.org/glsa/201701-47
https://support.apple.com/HT207170

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.