A c-ares security update has been released for openSUSE Leap 15.3.

openSUSE-SU-2021:2760-1: important: Security update for c-ares

openSUSE Security Update: Security update for c-ares
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Announcement ID: openSUSE-SU-2021:2760-1
Rating: important
References: #1188881
Cross-References: 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:
openSUSE Leap 15.3
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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

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