Auth bypass in Haxx Libcurl
CVE-2016-5420
curl and libcurl before 7.50.1 do not check the client certificate when choosing the TLS connection to reuse, which might allow remote attackers to hijack the authentication of the connection by leveraging a previously created connection with a different client certificate.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.154 (96.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.146 · newest: 0.154 · change: +0.008
Affected products
- Haxx Libcurl
- Debian Linux — versions 8.0
- openSUSE Leap — versions 42.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- rhn.redhat.com/errata/RHSA-2016-2575.html (vendor-advisory)
- access.redhat.com/errata/RHSA-2018:3558 (vendor-advisory)
- www.securityfocus.com/bid/92309 (vdb-entry)
- source.android.com/security/bulletin/2016-12-01.html
- www.slackware.com/security/viewer.php (vendor-advisory)
- www.securitytracker.com/id/1036739 (vdb-entry)
- www.debian.org/security/2016/dsa-3638 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-updates/2016-09/msg00011.html (vendor-advisory)
- www.tenable.com/security/tns-2016-18
- lists.opensuse.org/opensuse-updates/2016-09/msg00094.html (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-5420?
- CVE-2016-5420 is a high-severity vulnerability in Haxx Libcurl, classified under Improper Authorization. CVSS score: 7.5/10. Published 2016-08-10.
- How severe is CVE-2016-5420?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2016-5420 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.