CVE-2018-1000808 Pyopenssl Incorrect Memory Management
A memory leak in pyopenssl's PKCS #12 store handling can lead to denial of service by exhausting system memory during certificate reloads.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-1000808?
CVE-2018-1000808 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Python Cryptographic Authority pyopenssl version Before 17.5.0 contains a CWE - 401 : Failure to Release Memory Before Removing Last Reference vulnerability in PKCS #12 Store that can result in Denial of service if memory runs low or is exhausted. This attack appear to be exploitable via Depends upon calling application, however it could be as simple as initiating a TLS connection. Anything that would cause the calling application to reload certificates from a PKCS #12 store.. This vulnerability appears to have been fixed in 17.5.0.
Weakness: CWE-404
Which versions are affected by CVE-2018-1000808?
3 open source packages ship an affected version, including pyopenssl. It affects 7 products.
| Package | Affected | Fixed in |
|---|---|---|
pyopenssl PyPI | All versions | 17.5.0 |
pyopenssl PyPI | All versions | 17.5.0 |
pyopenssl PyPI | All versions | 17.5.0 |
Products include Canonical Ubuntu Linux, Pyopenssl Project Pyopenssl, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation, Redhat Gluster Storage and 1 more.
How do I fix CVE-2018-1000808?
Upgrade pyopenssl to 17.5.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2018-1000808 being exploited?
There is no known exploitation of CVE-2018-1000808 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2018-1000808, DEBIAN-CVE-2018-1000808, GHSA-2rcm-phc9-3945, PYSEC-2018-24, UBUNTU-CVE-2018-1000808.