CVE-2020-27840
First published: Mon Mar 22 2021(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Samba Samba | >=4.0.0<4.12.13 | |
| Samba Samba | >=4.13.0<4.13.6 | |
| Samba Samba | >=4.14.0<4.14.1 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| debian/ldb | <=2:2.2.0-3<=2:1.5.1+really1.4.6-3 | 2:2.2.0-3.1 2:1.5.1+really1.4.6-3+deb10u1 |
| debian/ldb | 2:1.5.1+really1.4.6-3+deb10u1 2:2.2.3-2~deb11u2 | |
| debian/samba | <=2:4.9.5+dfsg-5+deb10u3<=2:4.9.5+dfsg-5+deb10u4<=2:4.13.13+dfsg-1~deb11u5 | 2:4.17.12+dfsg-0+deb12u1 2:4.19.3+dfsg-2 |
| redhat/samba | <4.14.1 | 4.14.1 |
| redhat/samba | <4.13.6 | 4.13.6 |
| redhat/samba | <4.12.13 | 4.12.13 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1941400
- https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
- https://security.gentoo.org/glsa/202105-22
- https://security.netapp.com/advisory/ntap-20210326-0007/
- https://www.debian.org/security/2021/dsa-4884
- https://www.samba.org/samba/security/CVE-2020-27840.html
- https://bugzilla.samba.org/show_bug.cgi?id=14595
- https://security-tracker.debian.org/tracker/CVE-2020-27840
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27840
- https://security-tracker.debian.org/tracker/CVE-2021-20277
- https://security-tracker.debian.org/tracker/CVE-2020-10730
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985936
- https://git.samba.org/?p=samba.git;a=commitdiff;h=1996b79f376b459bb964a6344ca5f264e7d6e2ec
- https://git.samba.org/?p=samba.git;a=commitdiff;h=dbb3e65f7e382adf5fa6a6afb3d8684aca3f201a
- https://git.samba.org/?p=samba.git;a=commitdiff;h=9532c44baea130db74f866e1472cb871936cd3dd
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1942496
- https://access.redhat.com/security/cve/cve-2020-27840
Frequently Asked Questions
What is CVE-2020-27840?
CVE-2020-27840 is a vulnerability found in Samba that allows spaces used in a string around a domain name to write a zero-byte into out-of-bounds memory, resulting in a crash.
What is the severity of CVE-2020-27840?
The severity of CVE-2020-27840 is high, with a severity value of 7.5.
Which software is affected by CVE-2020-27840?
Samba versions 4.0.0 to 4.12.13, 4.13.0 to 4.13.6, and 4.14.0 to 4.14.1 are affected, as well as Debian Linux 9.0 and 10.0 and Fedora 32, 33, and 34.
How can I fix CVE-2020-27840?
To fix CVE-2020-27840, update Samba to versions 4.9.5+dfsg-5+deb10u4, 4.13.13+dfsg-1~deb11u5, 4.17.11+dfsg-0+deb12u1, or later.
Where can I find more information about CVE-2020-27840?
You can find more information about CVE-2020-27840 at the following references: [Bugzilla](https://bugzilla.samba.org/show_bug.cgi?id=14595), [Debian Security Tracker](https://security-tracker.debian.org/tracker/CVE-2020-27840), [MITRE CVE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27840).
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