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1072092 - net-snmp: denial of service flaw in Linux implementation of ICMP-MIB
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commit 8407b6ce46ca7159b3c816d1024e20a53f9a1c6c
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Author: Wes Hardaker <hardaker@users.sourceforge.net>
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Date: Wed Feb 19 15:21:57 2014 -0800
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bug fix from fenner: fix ICMP mib table handling on linux
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diff --git a/agent/mibgroup/mibII/icmp.c b/agent/mibgroup/mibII/icmp.c
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index 14c73a6..6d10426 100644
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--- a/agent/mibgroup/mibII/icmp.c
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+++ b/agent/mibgroup/mibII/icmp.c
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@@ -106,10 +106,20 @@ struct icmp_msg_stats_table_entry {
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int flags;
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};
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+#ifdef linux
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+/* Linux keeps track of all possible message types */
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+#define ICMP_MSG_STATS_IPV4_COUNT 256
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+#else
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#define ICMP_MSG_STATS_IPV4_COUNT 11
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+#endif
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#ifdef NETSNMP_ENABLE_IPV6
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+#ifdef linux
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+/* Linux keeps track of all possible message types */
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+#define ICMP_MSG_STATS_IPV6_COUNT 256
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+#else
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#define ICMP_MSG_STATS_IPV6_COUNT 14
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+#endif
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#else
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#define ICMP_MSG_STATS_IPV6_COUNT 0
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#endif /* NETSNMP_ENABLE_IPV6 */
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@@ -177,7 +187,7 @@ icmp_msg_stats_load(netsnmp_cache *cache, void *vmagic)
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inc = 0;
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linux_read_icmp_msg_stat(&v4icmp, &v4icmpmsg, &flag;;
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if (flag) {
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- while (254 != k) {
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+ while (255 >= k) {
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if (v4icmpmsg.vals[k].InType) {
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icmp_msg_stats_table[i].ipVer = 1;
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icmp_msg_stats_table[i].icmpMsgStatsType = k;
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@@ -267,7 +277,7 @@ icmp_msg_stats_load(netsnmp_cache *cache, void *vmagic)
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inc = 0;
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linux_read_icmp6_msg_stat(&v6icmp, &v6icmpmsg, &flag;;
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if (flag) {
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- while (254 != k) {
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+ while (255 >= k) {
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if (v6icmpmsg.vals[k].InType) {
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icmp_msg_stats_table[i].ipVer = 2;
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icmp_msg_stats_table[i].icmpMsgStatsType = k;
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@@ -1050,6 +1060,12 @@ icmp_stats_table_handler(netsnmp_mib_handler *handler,
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continue;
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table_info = netsnmp_extract_table_info(request);
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subid = table_info->colnum;
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+ DEBUGMSGTL(( "mibII/icmpStatsTable", "oid: " ));
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+ DEBUGMSGOID(( "mibII/icmpStatsTable", request->requestvb->name,
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+ request->requestvb->name_length ));
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+ DEBUGMSG(( "mibII/icmpStatsTable", " In %d InErr %d Out %d OutErr %d\n",
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+ entry->icmpStatsInMsgs, entry->icmpStatsInErrors,
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+ entry->icmpStatsOutMsgs, entry->icmpStatsOutErrors ));
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switch (subid) {
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case ICMP_STAT_INMSG:
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@@ -1117,6 +1133,11 @@ icmp_msg_stats_table_handler(netsnmp_mib_handler *handler,
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continue;
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table_info = netsnmp_extract_table_info(request);
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subid = table_info->colnum;
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+ DEBUGMSGTL(( "mibII/icmpMsgStatsTable", "oid: " ));
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+ DEBUGMSGOID(( "mibII/icmpMsgStatsTable", request->requestvb->name,
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+ request->requestvb->name_length ));
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+ DEBUGMSG(( "mibII/icmpMsgStatsTable", " In %d Out %d Flags 0x%x\n",
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+ entry->icmpMsgStatsInPkts, entry->icmpMsgStatsOutPkts, entry->flags ));
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switch (subid) {
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case ICMP_MSG_STAT_IN_PKTS:
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diff --git a/agent/mibgroup/mibII/kernel_linux.c b/agent/mibgroup/mibII/kernel_linux.c
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index b21a166..ba320c7 100644
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--- a/agent/mibgroup/mibII/kernel_linux.c
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+++ b/agent/mibgroup/mibII/kernel_linux.c
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@@ -81,9 +81,9 @@ decode_icmp_msg(char *line, char *data, struct icmp4_msg_mib *msg)
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index = strtol(token, &delim, 0);
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if (ERANGE == errno) {
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continue;
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- } else if (index > LONG_MAX) {
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+ } else if (index > 255) {
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continue;
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- } else if (index < LONG_MIN) {
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+ } else if (index < 0) {
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continue;
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}
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if (NULL == (token = strtok_r(dataptr, " ", &saveptr1)))
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@@ -94,9 +94,9 @@ decode_icmp_msg(char *line, char *data, struct icmp4_msg_mib *msg)
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index = strtol(token, &delim, 0);
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if (ERANGE == errno) {
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continue;
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- } else if (index > LONG_MAX) {
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+ } else if (index > 255) {
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continue;
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- } else if (index < LONG_MIN) {
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+ } else if (index < 0) {
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continue;
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}
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if(NULL == (token = strtok_r(dataptr, " ", &saveptr1)))
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@@ -426,14 +426,21 @@ linux_read_icmp6_parse(struct icmp6_mib *icmp6stat,
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vals = name;
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if (NULL != icmp6msgstat) {
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+ int type;
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if (0 == strncmp(name, "Icmp6OutType", 12)) {
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strsep(&vals, "e");
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- icmp6msgstat->vals[atoi(vals)].OutType = stats;
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+ type = atoi(vals);
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+ if ( type < 0 || type > 255 )
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+ continue;
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+ icmp6msgstat->vals[type].OutType = stats;
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*support = 1;
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continue;
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} else if (0 == strncmp(name, "Icmp6InType", 11)) {
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strsep(&vals, "e");
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- icmp6msgstat->vals[atoi(vals)].InType = stats;
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+ type = atoi(vals);
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+ if ( type < 0 || type > 255 )
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+ continue;
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+ icmp6msgstat->vals[type].InType = stats;
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*support = 1;
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continue;
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}
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diff --git a/agent/mibgroup/mibII/kernel_linux.h b/agent/mibgroup/mibII/kernel_linux.h
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index 6bf5d47..c6dfca9 100644
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--- a/agent/mibgroup/mibII/kernel_linux.h
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+++ b/agent/mibgroup/mibII/kernel_linux.h
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@@ -121,11 +121,11 @@ struct icmp_msg_mib {
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/* Lets use wrapper structures for future expansion */
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struct icmp4_msg_mib {
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- struct icmp_msg_mib vals[255];
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+ struct icmp_msg_mib vals[256];
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};
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struct icmp6_msg_mib {
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- struct icmp_msg_mib vals[255];
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+ struct icmp_msg_mib vals[256];
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};
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struct udp_mib {
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