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CVE-2020-27840

Date: May 12, 2021

A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.

Language: C

Severity Score

Related Resources (18)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
https://www.debian.org/security/2021/dsa-4884
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
https://security.gentoo.org/glsa/202105-22
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
https://github.com/samba-team/samba/commit/f89767bea7330ec1936d2312e2b1da7b435c04b7
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html
https://security.netapp.com/advisory/ntap-20210326-0007/
https://www.samba.org/samba/security/CVE-2020-27840.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-27840
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
https://bugzilla.redhat.com/show_bug.cgi?id=1941400
https://security-tracker.debian.org/tracker/CVE-2020-27840
https://nvd.nist.gov/vuln/detail/CVE-2020-27840
https://security.alpinelinux.org/vuln/CVE-2020-27840
https://www.mend.io/vulnerability-database/CVE-2020-27840

Severity Score

Weakness Type (CWE)

Out-of-bounds Read

CWE-125

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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