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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- freedesktop/dbus
- Source
- secalert@redhat.com
References
- https://bugs.gentoo.org/755392Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1909101
- https://gitlab.freedesktop.org/dbus/dbus/-/issues/305#note_829128
- https://security-tracker.debian.org/tracker/CVE-2020-35512
- https://bugs.gentoo.org/755392Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1909101
- https://gitlab.freedesktop.org/dbus/dbus/-/issues/305#note_829128
- https://security-tracker.debian.org/tracker/CVE-2020-35512
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.