Allocation of Resources Without Limits or Throttling Affecting tor package, versions <0.3.5.8-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Feb 2019
- disclosed21 Feb 2019
Introduced: 21 Feb 2019
CVE-2019-8955 (opens in a new tab)How to fix?
Upgrade Debian:unstable tor to version 0.3.5.8-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream tor package and not the tor package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
References
- https://security-tracker.debian.org/tracker/CVE-2019-8955
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8955
- https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312
- https://trac.torproject.org/projects/tor/ticket/29168
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00013.html
- http://www.securityfocus.com/bid/107136
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-8955