high
7.5
CWE
125
Advisory Published
CVE Published
Updated

CVE-2020-12783

First published: Mon May 11 2020(Updated: )

Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Exim Exim<=4.93
Fedoraproject Fedora=31
Fedoraproject Fedora=32
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.10
Canonical Ubuntu Linux=20.04
ubuntu/exim4<4.90.1-1ubuntu1.5
4.90.1-1ubuntu1.5
ubuntu/exim4<4.92.1-1ubuntu3.1
4.92.1-1ubuntu3.1
ubuntu/exim4<4.93-13ubuntu1.1
4.93-13ubuntu1.1
ubuntu/exim4<4.82-3ubuntu2.4+
4.82-3ubuntu2.4+
ubuntu/exim4<4.93-16
4.93-16
ubuntu/exim4<4.86.2-2ubuntu2.6
4.86.2-2ubuntu2.6
debian/exim4
4.94.2-7+deb11u2
4.94.2-7+deb11u3
4.96-15+deb12u4
4.96-15+deb12u5
4.98-1

Remedy

https://git.exim.org/exim.git/commit/57aa14b216432be381b6295c312065b2fd034f86

Remedy

https://git.exim.org/exim.git/commit/a04174dc2a84ae1008c23b6a7109e7fa3fb7b8b0

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-12783?

    CVE-2020-12783 is a vulnerability in Exim version 4.93 and earlier that allows for an out-of-bounds read in the SPA authenticator, potentially leading to authentication bypass.

  • What is the severity of CVE-2020-12783?

    The severity of CVE-2020-12783 is high with a CVSS score of 7.5.

  • Which software versions are affected by CVE-2020-12783?

    Exim versions up to and including 4.93 are affected by CVE-2020-12783.

  • How can I fix CVE-2020-12783 on Ubuntu?

    To fix CVE-2020-12783 on Ubuntu, you can update the 'exim4' package to version 4.93-16 or later.

  • Where can I find more information about CVE-2020-12783?

    You can find more information about CVE-2020-12783 on the MITRE CVE database, Ubuntu security notices, and NVD.

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