Buffer overflow in Haproxy
CVE-2020-11100
In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2 request, possibly causing remote code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.616 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.607 · newest: 0.616 · change: +0.009
Affected products
- Haproxy
- Canonical Ubuntu Linux — versions 18.04, 19.10
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 30, 31
- openSUSE Leap — versions 15.1
- Red Hat Openshift Container Platform — versions 3.11, 4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.haproxy.org (Vendor Advisory)
- www.haproxy.org/download/2.1/src/CHANGELOG (Release Notes, Vendor Advisory)
- lists.debian.org/debian-security-announce/2020/msg00052.html (Mailing List, Third Party Advisory)
- www.mail-archive.com/haproxy@formilux.org/msg36876.html
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- git.haproxy.org/
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- lists.opensuse.org/opensuse-security-announce/2020-04/msg00002.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2020/dsa-4649 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-11100?
- CVE-2020-11100 is a high-severity vulnerability in Haproxy, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-04-02.
- How severe is CVE-2020-11100?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-11100 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.