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SUSE Linux: 2021:2760-1 Important: c-ares DNS Input Flaw

suse
Calendar Grey August 17, 2021
Dist Suse Esm H88
SUSE Security Alert addresses severe vulnerabilities in c-ares related to input checks and halts system crashes triggered by DNS replies.
An update that fixes one vulnerability is now available

Summary

This update for c-ares fixes the following issues: Version update to git snapshot 1.17.1+20200724: - CVE-2021-3672: fixed missing input validation on hostnames returned by DNS servers (bsc#1188881) - If ares_getaddrinfo() was terminated by an ares_destroy(), it would cause crash - Crash in sortaddrinfo() if the list size equals 0 due to an unexpected DNS response - Expand number of escaped characters in DNS replies as per RFC1035 5.1 to prevent spoofing - Use unbuffered /dev/urandom for random data to prevent early startup performance issues Patch Instructions: To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: - SUSE Manager Server 4.0:

Topics%20covered

Topics Covered

security advisory software update important input validation DNS issue SUSE Manager c-ares

References

#1188881

Cross- CVE-2021-3672

CVSS scores:

CVE-2021-3672 (SUSE): 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected Products:

SUSE Manager Server 4.0

SUSE Manager Retail Branch Server 4.0

SUSE Manager Proxy 4.0

SUSE Linux Enterprise Server for SAP 15-SP1

SUSE Linux Enterprise Server for SAP 15

SUSE Linux Enterprise Server 15-SP1-LTSS

SUSE Linux Enterprise Server 15-SP1-BCL

SUSE Linux Enterprise Server 15-LTSS

SUSE Linux Enterprise Module for Basesystem 15-SP3

SUSE Linux Enterprise Module for Basesystem 15-SP2

SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS

SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS

SUSE Linux Enterprise High Performance Computing 15-LTSS

S...

Read the Full Advisory

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2021:2760-1
Rating: important

Topics%20covered

Topics Covered

security advisory software update important input validation DNS issue SUSE Manager c-ares

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