Ubuntu.comUB:CVE-2021-34813CVE-2021-34813
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
89.3%
Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a
client (while it is attempting to retrieve an Olm encrypted room key backup
from the homeserver) because olm_pk_decrypt has a stack-based buffer
overflow. Remote code execution might be possible for some nonstandard
build configurations.
References
gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b
gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3
launchpad.net/bugs/cve/CVE-2021-34813
matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm
nvd.nist.gov/vuln/detail/CVE-2021-34813
security-tracker.debian.org/tracker/CVE-2021-34813
ubuntu.com/security/notices/USN-5194-1
www.cve.org/CVERecord?id=CVE-2021-34813
Related
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
89.3%