Fixes the following security issues:
- CVE-2021-33195: The LookupCNAME, LookupSRV, LookupMX, LookupNS, and
LookupAddr functions in net, and their respective methods on the Resolver
type may return arbitrary values retrieved from DNS which do not follow
the established RFC 1035 rules for domain names. If these names are used
without further sanitization, for instance unsafely included in HTML, they
may allow for injection of unexpected content. Note that LookupTXT may
still return arbitrary values that could require sanitization before
further use
- CVE-2021-33196: The NewReader and OpenReader functions in archive/zip can
cause a panic or an unrecoverable fatal error when reading an archive that
claims to contain a large number of files, regardless of its actual size
- CVE-2021-33197: ReverseProxy in net/http/httputil could be made to forward
certain hop-by-hop headers, including Connection. In case the target of
the ReverseProxy was itself a reverse proxy, this would let an attacker
drop arbitrary headers, including those set by the ReverseProxy.Director
- CVE-2021-33198: The SetString and UnmarshalText methods of math/big.Rat
may cause a panic or an unrecoverable fatal error if passed inputs with
very large exponents
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
0c60007419