Debian Security Advisory DSA 4385-1 (dovecot - security update)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

4.9

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:M/Au:S/C:P/I:P/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

3 years ago

Modified

Modified

3 years ago

Summary

halfdog discovered an authentication bypass vulnerability in the Dovecot email server. Under some configurations Dovecot mistakenly trusts the username provided via authentication instead of failing. If there is no additional password verification, this allows the attacker to login as anyone else in the system. Only installations using: auth_ssl_require_client_cert = yesauth_ssl_username_from_cert = yes are affected by this flaw.

Affected Software

Affected Software

dovecot on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For the stable distribution (stretch), this problem has been fixed in version 1:2.2.27-3+deb9u3. We recommend that you upgrade your dovecot packages. For the detailed security status of dovecot please refer to its security tracker page linked in the references.

Common Vulnerabilities and Exposures (CVE)

Ready to dive in? Start your free trial today.

Companies of all sizes—from startups to Fortune 500s—use Mageni to scan their assets for vulnerabilities, reduce risk exposure and minimizing the likelihood of a data breach. Free for 7-days then $39 USD Monthly. No Contracts, Cancel at Anytime and 7-days Money-Back Guarantee.

Get Started For Free
App screenshot