net-ftp/atftp: Add -r addressing CVE 2020-6097

Patch sourced from:
https://sourceforge.net/u/peterkaestle/atftp/ci/96409ef3b9ca061f9527cfaafa778105cf15d994/

Bug: https://bugs.gentoo.org/741566
Signed-off-by: Tobias Klausmann <klausman@gentoo.org>

1 files changed, 92 insertions, 0 deletions

diff --git a/net-ftp/atftp/files/atftp-0.7.2-cve-2020-6097.patch b/net-ftp/atftp/files/atftp-0.7.2-cve-2020-6097.patch
new file mode 100644
index 000000000000..5130d0086432
--- /dev/null
+++ b/net-ftp/atftp/files/atftp-0.7.2-cve-2020-6097.patch
@@ -0,0 +1,92 @@
+commit 96409ef3b9ca061f9527cfaafa778105cf15d994
+Author: Peter Kaestle <peter.kaestle@nokia.com>
+Date:   Wed Oct 14 14:02:41 2020 +0200
+
+    Fix for DoS issue CVE-2020-6097
+    
+    "sockaddr_print_addr" of tftpd can be triggered remotely to call
+    assert(), which will crash the tftpd daemon.  See:
+    https://talosintelligence.com/vulnerability_reports/TALOS-2020-1029
+    
+    "sockaddr_print_addr" originaly had two features:
+    1) returning pointer to string of the incoming ip address
+    2) checking whether ss_family of the connection is supported
+    
+    To fix the issue, a separate function "sockaddr_family_supported" is
+    used to take care of 2) and "sockaddr_print_addr" returns an error
+    message string for unsupported cases when using 1) insert of calling
+    assert().
+
+diff --git a/tftp_def.c b/tftp_def.c
+index d457c2a..428a930 100644
+--- a/tftp_def.c
++++ b/tftp_def.c
+@@ -180,6 +180,15 @@ int Gethostbyname(char *addr, struct hostent *host)
+      return OK;
+ }
+ 
++int
++sockaddr_family_supported(const struct sockaddr_storage *ss)
++{
++     if (ss->ss_family == AF_INET || ss->ss_family == AF_INET6)
++          return 1;
++     else
++          return 0;
++}
++
+ char *
+ sockaddr_print_addr(const struct sockaddr_storage *ss, char *buf, size_t len)
+ {
+@@ -189,7 +198,7 @@ sockaddr_print_addr(const struct sockaddr_storage *ss, char *buf, size_t len)
+      else if (ss->ss_family == AF_INET6)
+           addr = &((const struct sockaddr_in6 *)ss)->sin6_addr;
+      else
+-          assert(!"sockaddr_print: unsupported address family");
++          return "sockaddr_print: unsupported address family";
+      return (char *)inet_ntop(ss->ss_family, addr, buf, len);
+ }
+ 
+diff --git a/tftp_def.h b/tftp_def.h
+index 0841746..458e310 100644
+--- a/tftp_def.h
++++ b/tftp_def.h
+@@ -54,6 +54,7 @@ int print_eng(double value, char *string, int size, char *format);
+ inline char *Strncpy(char *to, const char *from, size_t size);
+ int Gethostbyname(char *addr, struct hostent *host);
+ 
++int sockaddr_family_supported(const struct sockaddr_storage *ss);
+ char *sockaddr_print_addr(const struct sockaddr_storage *, char *, size_t);
+ #define SOCKADDR_PRINT_ADDR_LEN INET6_ADDRSTRLEN
+ uint16_t sockaddr_get_port(const struct sockaddr_storage *);
+diff --git a/tftpd.c b/tftpd.c
+index 0b6f6a5..a7561a5 100644
+--- a/tftpd.c
++++ b/tftpd.c
+@@ -644,6 +644,11 @@ void *tftpd_receive_request(void *arg)
+      }
+ 
+ #ifdef HAVE_WRAP
++     if (!abort && !sockaddr_family_supported(&data->client_info->client))
++     {
++          logger(LOG_ERR, "Connection from unsupported network address family refused");
++          abort = 1;
++     }
+      if (!abort)
+      {
+           /* Verify the client has access. We don't look for the name but
+diff --git a/tftpd_mtftp.c b/tftpd_mtftp.c
+index d420d10..0032905 100644
+--- a/tftpd_mtftp.c
++++ b/tftpd_mtftp.c
+@@ -393,6 +393,11 @@ void *tftpd_mtftp_server(void *arg)
+                                         &data_size, data->data_buffer);
+ 
+ #ifdef HAVE_WRAP
++               if (!sockaddr_family_supported(&sa))
++               {
++                    logger(LOG_ERR, "mtftp: Connection from unsupported network address family refused");
++                    continue;
++               }
+                /* Verify the client has access. We don't look for the name but
+                   rely only on the IP address for that. */
+                sockaddr_print_addr(&sa, addr_str, sizeof(addr_str));