Use After Free in Freedesktop Dbus
CVE-2020-35512
A use-after-free flaw was found in D-Bus Development branch <= 1.13.16, dbus-1.12.x stable branch <= 1.12.18, and dbus-1.10.x and older branches <= 1.10.30 when a system has multiple usernames sharing the same UID. When a set of policy rules references these usernames, D-Bus may free some memory in the heap, which is still used by data structures necessary for the other usernames sharing the UID, possibly leading to a crash or other undefined behaviors
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (26.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Freedesktop Dbus — versions 1.12.20
- Linux Kernel
- Dbus-1.10.x And Older Branches (Eol) — versions <= 1.10.30 (Fixed: 1.10.32)
- Dbus-1.12.x Stable Branch — versions <= 1.12.18 (Fixed: >= 1.12.20)
- D-Bus Development Branch — versions <= 1.13.16 (Fixed: >= 1.13.18)
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.gentoo.org/755392 (Third Party Advisory, Issue Tracking)
- gitlab.freedesktop.org/dbus/dbus/-/issues/305
- bugzilla.redhat.com/show_bug.cgi
- security-tracker.debian.org/tracker/CVE-2020-35512
Frequently asked questions
- What is CVE-2020-35512?
- CVE-2020-35512 is a high-severity vulnerability in Freedesktop Dbus, classified under Use After Free. CVSS score: 7.8/10. Published 2021-02-15.
- How severe is CVE-2020-35512?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-35512 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.