(RHSA-2021:1853) Moderate: unbound security, bug fix, and enhancement update

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

Security Fix(es):

• unbound: integer overflow in the regional allocator via regional_alloc (CVE-2019-25032)

• unbound: integer overflow in sldns_str2wire_dname_buf_origin can lead to an out-of-bounds write (CVE-2019-25034)

• unbound: out-of-bounds write in sldns_bget_token_par (CVE-2019-25035)

• unbound: assertion failure and denial of service in synth_cname (CVE-2019-25036)

• unbound: assertion failure and denial of service in dname_pkt_copy via an invalid packet (CVE-2019-25037)

• unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c (CVE-2019-25038)

• unbound: integer overflow in a size calculation in respip/respip.c (CVE-2019-25039)

• unbound: infinite loop via a compressed name in dname_pkt_copy (CVE-2019-25040)

• unbound: assertion failure via a compressed name in dname_pkt_copy (CVE-2019-25041)

• unbound: out-of-bounds write via a compressed name in rdata_copy (CVE-2019-25042)

• unbound: symbolic link traversal when writing PID file (CVE-2020-28935)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.