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AUSCERT External Security Bulletin Redistribution
ESB-2020.0310
USN-4256-1: Cyrus SASL vulnerability
29 January 2020
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AusCERT Security Bulletin Summary
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Product: cyrus-sasl2
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-19906
Reference: ESB-2019.4770.2
Original Bulletin:
https://usn.ubuntu.com/4256-1/
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USN-4256-1: Cyrus SASL vulnerability
28 January 2020
cyrus-sasl2 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
o Ubuntu 12.04 ESM
Summary
Cyrus SASL could be made to crash or execute arbitrary code if it received a
specially crafted LDAP packet.
Software Description
o cyrus-sasl2 - Cyrus Simple Authentication and Security Layer
Details
It was discovered that Cyrus SASL incorrectly handled certain LDAP packets. An
attacker could possibly use this issue to execute arbitrary code or cause a
denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.10
libsasl2-2 - 2.1.27+dfsg-1ubuntu0.1
Ubuntu 18.04 LTS
libsasl2-2 - 2.1.27~101-g0780600+dfsg-3ubuntu2.1
Ubuntu 16.04 LTS
libsasl2-2 - 2.1.26.dfsg1-14ubuntu0.2
Ubuntu 14.04 ESM
libsasl2-2 - 2.1.25.dfsg1-17ubuntu0.1~esm1
Ubuntu 12.04 ESM
libsasl2-2 - 2.1.25.dfsg1-3ubuntu0.2
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
After a standard system update you need to restart services using SASL to
effect the necessary changes.
References
o CVE-2019-19906
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