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openSUSE Leap 15.3 Important: c-ares Input Validation Issue - CVE-2021-3672

opensuse
Calendar Grey August 17, 2021
Dist Opensuse Esm H88
Address the critical c-ares vulnerability through this openSUSE upgrade. Fortify your network's resilience now!
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

Topics%20covered

Topics Covered

security advisory input validation important advisory network 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 15.3:

zypper in -t patch openSUSE-SLE-15.3-2021-2760=1

Package List

- openSUSE Leap 15.3 (aarch64 ppc64le s390x x86_64):

c-ares-debugsource-1.17.1+20200724-3.14.1

c-ares-devel-1.17.1+20200724-3.14.1

c-ares-utils-1.17.1+20200724-3.14.1

c-ares-utils-debuginfo-1.17.1+20200724-3.14.1

libcares2-1.17.1+20200724-3.14.1

libcares2-debuginfo-1.17.1+20200724-3.14.1

- openSUSE Leap 15.3 (x86_64):

libcares2-32bit-1.17.1+20200724-3.14.1

libcares2-32bit-debuginfo-1.17.1+20200724-3.14.1

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-2021:2760-1
Rating: important
Affected Products: openSUSE Leap 15.3 .

Topics%20covered

Topics Covered

security advisory input validation important advisory network issue openSUSE c-ares

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