Vulnerability of Exim: buffer overflow in string_vformat

Synthesis of the vulnerability

An attacker can trigger a buffer overflow in string_vformat() in Exim, in order to trigger a denial of service, and possibly to run code.

Vulnerable systems: Debian, Exim, openSUSE Leap, SLES, Ubuntu.

Severity of this threat: 2/4.

Creation date: 30/09/2019.

Références of this weakness: 2449, CERTFR-2019-AVI-474, CVE-2019-16928, DSA-4536-1, openSUSE-SU-2021:0677-1, openSUSE-SU-2021:0753-1, openSUSE-SU-2021:0754-1, USN-4141-1, VIGILANCE-VUL-30470.

Description of the vulnerability

An attacker can trigger a buffer overflow in string_vformat() in Exim, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity threat impacts software or systems such as Debian, Exim, openSUSE Leap, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat note is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this security threat.

Solutions for this threat

Exim: version 4.92.3.
The version 4.92.3 is fixed:
https://ftp.exim.org/pub/exim/exim4/exim-4.92.3.tar.bz2

Debian 10: new exim4 packages.
New packages are available:
Debian 10: exim4 4.92-8+deb10u3

openSUSE Leap 15.2: new exim packages.
New packages are available:
openSUSE Leap 15.2: exim 4.94.2-lp152.8.3.1

SUSE LE 15 SP1: new exim packages.
New packages are available:
SUSE LE 15 SP1: exim 4.94.2-bp151.2.4.1

SUSE LE 15 SP2: new exim packages.
New packages are available:
SUSE LE 15 SP2: exim 4.94.2-bp152.6.4.1

Ubuntu: new Exim packages.
New packages are available:
Ubuntu 19.04: exim4-daemon-heavy 4.92-4ubuntu1.4, exim4-daemon-light 4.92-4ubuntu1.4
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