CVE-2019-15846
First published: Fri Sep 06 2019(Updated: )
Exim before 4.92.2 allows remote attackers to execute arbitrary code as root via a trailing backslash.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Exim Exim | <4.92.2 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| ubuntu/exim4 | <4.90.1-1ubuntu1.4 | 4.90.1-1ubuntu1.4 |
| ubuntu/exim4 | <4.92-4ubuntu1.3 | 4.92-4ubuntu1.3 |
| ubuntu/exim4 | <4.82-3ubuntu2.4+ | 4.82-3ubuntu2.4+ |
| ubuntu/exim4 | <4.86.2-2ubuntu2.5 | 4.86.2-2ubuntu2.5 |
| debian/exim4 | 4.94.2-7+deb11u2 4.94.2-7+deb11u3 4.96-15+deb12u4 4.96-15+deb12u5 4.98-1 |
Remedy
Add - as part of the mail ACL (the ACL referenced by the main config option "acl_smtp_mail"): deny condition = ${if eq{\\}{${substr{-1}{1}{$tls_in_sni}}}} deny condition = ${if eq{\\}{${substr{-1}{1}{$tls_in_peerdn}}}}
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Reference Links
- http://exim.org/static/doc/security/CVE-2019-15846.txt
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00024.html
- http://www.openwall.com/lists/oss-security/2019/09/06/2
- http://www.openwall.com/lists/oss-security/2019/09/06/4
- http://www.openwall.com/lists/oss-security/2019/09/06/5
- http://www.openwall.com/lists/oss-security/2019/09/06/6
- http://www.openwall.com/lists/oss-security/2019/09/06/8
- http://www.openwall.com/lists/oss-security/2019/09/07/1
- http://www.openwall.com/lists/oss-security/2019/09/07/2
- http://www.openwall.com/lists/oss-security/2019/09/08/1
- http://www.openwall.com/lists/oss-security/2019/09/09/1
- https://exim.org/static/doc/security/CVE-2019-15846.txt
- https://lists.debian.org/debian-lts-announce/2019/09/msg00004.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FT3GY7V7SR2RHKNZNQCGXFWUSILVSZNU/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDF37AUNETIOXY6ZLQAUBGBVUTMMV242/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SBNHDAF74RI6VK2JVSEIE3VYNL7JJDYM/
- https://seclists.org/bugtraq/2019/Sep/13
- https://security.gentoo.org/glsa/201909-06
- https://usn.ubuntu.com/4124-1/
- https://usn.ubuntu.com/4124-2/
- https://www.debian.org/security/2019/dsa-4517
- https://www.kb.cert.org/vuls/id/672565
- https://www.openwall.com/lists/oss-security/2019/09/06/1
- https://launchpad.net/bugs/cve/CVE-2019-15846
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FT3GY7V7SR2RHKNZNQCGXFWUSILVSZNU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NDF37AUNETIOXY6ZLQAUBGBVUTMMV242/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SBNHDAF74RI6VK2JVSEIE3VYNL7JJDYM/
- https://www.openwall.com/lists/oss-security/2019/09/04/1
- https://git.exim.org/exim.git/commit/2600301ba6dbac5c9d640c87007a07ee6dcea1f4
- https://security-tracker.debian.org/tracker/CVE-2019-15846
- https://www.exim.org/static/doc/security/CVE-2019-15846.txt
- https://ubuntu.com/security/notices/USN-4124-1
- https://ubuntu.com/security/notices/USN-4124-2
- https://www.cve.org/CVERecord?id=CVE-2019-15846
- https://nvd.nist.gov/vuln/detail/CVE-2019-15846
- https://ubuntu.com/security/CVE-2019-15846
Frequently Asked Questions
What is CVE-2019-15846?
CVE-2019-15846 is a vulnerability in Exim, a popular mail transfer agent, that allows remote attackers to execute arbitrary code as root.
What is the severity of CVE-2019-15846?
The severity of CVE-2019-15846 is critical with a CVSS score of 9.8.
Which software versions are affected by CVE-2019-15846?
The affected software versions are Exim versions before 4.92.2.
How can I fix CVE-2019-15846?
To fix CVE-2019-15846, you should update Exim to version 4.92.2 or higher.
Where can I find more information about CVE-2019-15846?
You can find more information about CVE-2019-15846 on the following references: [1] http://exim.org/static/doc/security/CVE-2019-15846.txt [2] http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00024.html [3] http://www.openwall.com/lists/oss-security/2019/09/06/2
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