Auth bypass in Apache HTTP Server
CVE-2018-1312
In Apache httpd 2.2.0 to 2.4.29, when generating an HTTP Digest authentication challenge, the nonce sent to prevent reply attacks was not correctly generated using a pseudo-random seed. In a cluster of servers using a common Digest authentication configuration, HTTP requests could be replayed across servers by an attacker without detection.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.157 (96.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.158 · newest: 0.157 · change: -0.001
Affected products
- Apache HTTP Server — versions 2.4.1, 2.4.2, 2.4.3
- Apache Software Foundation HTTP Server — versions 2.0.42 to 2.4.29
- NetApp Cloud Backup
- NetApp Clustered Data Ontap
- NetApp Storagegrid
- Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
- Debian Linux — versions 7.0, 8.0, 9.0
- Red Hat Enterprise Linux — versions 6.0, 7.0
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Eus — versions 7.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- usn.ubuntu.com/3627-1/ (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2018/dsa-4164 (vendor-advisory, Third Party Advisory)
- security.netapp.com/advisory/ntap-20180601-0004/ (Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3558 (vendor-advisory, Third Party Advisory)
- support.hpe.com/hpsc/doc/public/display (Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0367 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3627-2/ (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/103524 (VDB Entry, Third Party Advisory, vdb-entry)
- www.openwall.com/lists/oss-security/2018/03/24/7 (mailing-list, Mailing List, Third Party Advisory)
- httpd.apache.org/security/vulnerabilities_24.html (Vendor Advisory)
Frequently asked questions
- What is CVE-2018-1312?
- CVE-2018-1312 is a critical-severity vulnerability in Apache HTTP Server, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-03-26.
- How severe is CVE-2018-1312?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2018-1312 known to be exploited?
- 38 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.