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openSUSE 15.2: 2021:1168-1 Important: c-ares Input Validation Issue

opensuse
Calendar Grey August 19, 2021
Dist Opensuse Esm H88
Significant openSUSE patch for c-ares resolves urgent vulnerabilities, bolstering DNS protection and avoiding system failures.
An update that fixes one vulnerability is now available

Description

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

This update was imported from the SUSE:SLE-15:Update update project.

Topics%20covered

Topics Covered

security advisory update critical patch input validation DNS issue openSUSE c-ares

Patch

Patch Instructions:

To install this openSUSE 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:

- openSUSE Leap 15.2:

zypper in -t patch openSUSE-2021-1168=1

Package List

- openSUSE Leap 15.2 (i586 x86_64):

c-ares-debugsource-1.17.1+20200724-lp152.2.9.1

c-ares-devel-1.17.1+20200724-lp152.2.9.1

c-ares-utils-1.17.1+20200724-lp152.2.9.1

c-ares-utils-debuginfo-1.17.1+20200724-lp152.2.9.1

libcares2-1.17.1+20200724-lp152.2.9.1

libcares2-debuginfo-1.17.1+20200724-lp152.2.9.1

- openSUSE Leap 15.2 (x86_64):

libcares2-32bit-1.17.1+20200724-lp152.2.9.1

libcares2-32bit-debuginfo-1.17.1+20200724-lp152.2.9.1

References

https://www.suse.com/security/cve/CVE-2021-3672.html

https://bugzilla.suse.com/1188881

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: openSUSE-SU-2021:1168-1
Rating: important
Affected Products: openSUSE Leap 15.2 .

Topics%20covered

Topics Covered

security advisory update critical patch input validation DNS issue openSUSE c-ares

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