Auth bypass in Haxx Curl
CVE-2016-0755
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.093 (95.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.093 · newest: 0.093 · change: 0.000
Affected products
- Haxx Curl
- Canonical Ubuntu Linux — versions 12.04, 14.04, 15.04
- Debian Linux — versions 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.fedoraproject.org/pipermail/package-announce/2016-January/176413.html (vendor-advisory)
- packetstormsecurity.com/files/135695/Slackware-Security-Advisory-curl-Updates.h…
- lists.opensuse.org/opensuse-updates/2016-02/msg00031.html (vendor-advisory)
- lists.fedoraproject.org/pipermail/package-announce/2016-February/176546.html (vendor-advisory)
- lists.apple.com/archives/security-announce/2016/Sep/msg00006.html (vendor-advisory)
- curl.haxx.se/docs/adv_20160127A.html (Vendor Advisory)
- www.slackware.com/security/viewer.php (vendor-advisory)
- www.debian.org/security/2016/dsa-3455 (vendor-advisory)
- lists.opensuse.org/opensuse-updates/2016-02/msg00047.html (vendor-advisory)
- www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
Frequently asked questions
- What is CVE-2016-0755?
- CVE-2016-0755 is a high-severity vulnerability in Haxx Curl, classified under Improper Authentication. CVSS score: 7.3/10. Published 2016-01-29.
- How severe is CVE-2016-0755?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2016-0755 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.