From b3e74778c65ba3ffc8a9b3133c87588ee5d18a74 Mon Sep 17 00:00:00 2001 From: Chrostoper Ertl Date: Thu, 28 Nov 2019 16:33:59 +0000 Subject: [PATCH] Fixes for CVE-2020-5208 see https://github.com/ipmitool/ipmitool/security/advisories/GHSA-g659-9qxw-p7cp This patch is combination of following commits: pick e824c23316ae50beb7f7488f2055ac65e8b341f2 fru: Fix buffer overflow vulnerabilities pick 840fb1cbb4fb365cb9797300e3374d4faefcdb10 fru: Fix buffer overflow in ipmi_spd_print_fru pick 41d7026946fafbd4d1ec0bcaca3ea30a6e8eed22 session: Fix buffer overflow in ipmi_get_session_info pick 9452be87181a6e83cfcc768b3ed8321763db50e4 channel: Fix buffer overflow pick d45572d71e70840e0d4c50bf48218492b79c1a10 lanp: Fix buffer overflows in get_lan_param_select pick 7ccea283dd62a05a320c1921e3d8d71a87772637 fru, sdr: Fix id_string buffer overflows --- lib/dimm_spd.c | 9 ++++++++- lib/ipmi_channel.c | 5 ++++- lib/ipmi_fru.c | 35 ++++++++++++++++++++++++++++++++--- lib/ipmi_lanp.c | 14 +++++++------- lib/ipmi_sdr.c | 40 ++++++++++++++++++++++++---------------- lib/ipmi_session.c | 12 ++++++++---- 6 files changed, 83 insertions(+), 32 deletions(-) diff --git a/lib/dimm_spd.c b/lib/dimm_spd.c index 41e30db..68f3b4f 100644 --- a/lib/dimm_spd.c +++ b/lib/dimm_spd.c @@ -1621,7 +1621,7 @@ ipmi_spd_print_fru(struct ipmi_intf * intf, uint8_t id) struct ipmi_rq req; struct fru_info fru; uint8_t *spd_data, msg_data[4]; - int len, offset; + uint32_t len, offset; msg_data[0] = id; @@ -1697,6 +1697,13 @@ ipmi_spd_print_fru(struct ipmi_intf * intf, uint8_t id) } len = rsp->data[0]; + if(rsp->data_len < 1 + || len > rsp->data_len - 1 + || len > fru.size - offset) + { + printf(" Not enough buffer size"); + return -1; + } memcpy(&spd_data[offset], rsp->data + 1, len); offset += len; } while (offset < fru.size); diff --git a/lib/ipmi_channel.c b/lib/ipmi_channel.c index 3ae3104..80ba522 100644 --- a/lib/ipmi_channel.c +++ b/lib/ipmi_channel.c @@ -447,7 +447,10 @@ ipmi_get_channel_cipher_suites(struct ipmi_intf *intf, const char *payload_type, lprintf(LOG_ERR, "Unable to Get Channel Cipher Suites"); return -1; } - if (rsp->ccode > 0) { + if (rsp->ccode + || rsp->data_len < 1 + || rsp->data_len > sizeof(uint8_t) ) + { lprintf(LOG_ERR, "Get Channel Cipher Suites failed: %s", val2str(rsp->ccode, completion_code_vals)); return -1; diff --git a/lib/ipmi_fru.c b/lib/ipmi_fru.c index cf00eff..98bc984 100644 --- a/lib/ipmi_fru.c +++ b/lib/ipmi_fru.c @@ -615,7 +615,10 @@ int read_fru_area(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, uint32_t offset, uint32_t length, uint8_t *frubuf) { - uint32_t off = offset, tmp, finish; + uint32_t off = offset; + uint32_t tmp; + uint32_t finish; + uint32_t size_left_in_buffer; struct ipmi_rs * rsp; struct ipmi_rq req; uint8_t msg_data[4]; @@ -628,10 +631,12 @@ read_fru_area(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, finish = offset + length; if (finish > fru->size) { + memset(frubuf + fru->size, 0, length - fru->size); finish = fru->size; lprintf(LOG_NOTICE, "Read FRU Area length %d too large, " "Adjusting to %d", offset + length, finish - offset); + length = finish - offset; } memset(&req, 0, sizeof(req)); @@ -667,6 +672,7 @@ read_fru_area(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, } } + size_left_in_buffer = length; do { tmp = fru->access ? off >> 1 : off; msg_data[0] = id; @@ -707,9 +713,18 @@ read_fru_area(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, } tmp = fru->access ? rsp->data[0] << 1 : rsp->data[0]; + if(rsp->data_len < 1 + || tmp > rsp->data_len - 1 + || tmp > size_left_in_buffer) + { + printf(" Not enough buffer size"); + return -1; + } + memcpy(frubuf, rsp->data + 1, tmp); off += tmp; frubuf += tmp; + size_left_in_buffer -= tmp; /* sometimes the size returned in the Info command * is too large. return 0 so higher level function * still attempts to parse what was returned */ @@ -742,7 +757,9 @@ read_fru_area_section(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, uint32_t offset, uint32_t length, uint8_t *frubuf) { static uint32_t fru_data_rqst_size = 20; - uint32_t off = offset, tmp, finish; + uint32_t off = offset; + uint32_t tmp, finish; + uint32_t size_left_in_buffer; struct ipmi_rs * rsp; struct ipmi_rq req; uint8_t msg_data[4]; @@ -755,10 +772,12 @@ read_fru_area_section(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, finish = offset + length; if (finish > fru->size) { + memset(frubuf + fru->size, 0, length - fru->size); finish = fru->size; lprintf(LOG_NOTICE, "Read FRU Area length %d too large, " "Adjusting to %d", offset + length, finish - offset); + length = finish - offset; } memset(&req, 0, sizeof(req)); @@ -773,6 +792,8 @@ read_fru_area_section(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, if (fru->access && fru_data_rqst_size > 16) #endif fru_data_rqst_size = 16; + + size_left_in_buffer = length; do { tmp = fru->access ? off >> 1 : off; msg_data[0] = id; @@ -804,8 +825,16 @@ read_fru_area_section(struct ipmi_intf * intf, struct fru_info *fru, uint8_t id, } tmp = fru->access ? rsp->data[0] << 1 : rsp->data[0]; + if(rsp->data_len < 1 + || tmp > rsp->data_len - 1 + || tmp > size_left_in_buffer) + { + printf(" Not enough buffer size"); + return -1; + } memcpy((frubuf + off)-offset, rsp->data + 1, tmp); off += tmp; + size_left_in_buffer -= tmp; /* sometimes the size returned in the Info command * is too large. return 0 so higher level function @@ -3033,7 +3062,7 @@ ipmi_fru_print(struct ipmi_intf * intf, struct sdr_record_fru_locator * fru) return 0; memset(desc, 0, sizeof(desc)); - memcpy(desc, fru->id_string, fru->id_code & 0x01f); + memcpy(desc, fru->id_string, __min(fru->id_code & 0x01f, sizeof(desc))); desc[fru->id_code & 0x01f] = 0; printf("FRU Device Description : %s (ID %d)\n", desc, fru->device_id); diff --git a/lib/ipmi_lanp.c b/lib/ipmi_lanp.c index 65d881b..022c7f1 100644 --- a/lib/ipmi_lanp.c +++ b/lib/ipmi_lanp.c @@ -1809,7 +1809,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); /* set new ipaddr */ memcpy(data+3, temp, 4); printf("Setting LAN Alert %d IP Address to %d.%d.%d.%d\n", alert, @@ -1824,7 +1824,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); /* set new macaddr */ memcpy(data+7, temp, 6); printf("Setting LAN Alert %d MAC Address to " @@ -1838,7 +1838,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); if (strncasecmp(argv[1], "def", 3) == 0 || strncasecmp(argv[1], "default", 7) == 0) { @@ -1864,7 +1864,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); if (strncasecmp(argv[1], "on", 2) == 0 || strncasecmp(argv[1], "yes", 3) == 0) { @@ -1889,7 +1889,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); if (strncasecmp(argv[1], "pet", 3) == 0) { printf("Setting LAN Alert %d destination to PET Trap\n", alert); @@ -1917,7 +1917,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); if (str2uchar(argv[1], &data[2]) != 0) { lprintf(LOG_ERR, "Invalid time: %s", argv[1]); @@ -1933,7 +1933,7 @@ ipmi_lan_alert_set(struct ipmi_intf * intf, uint8_t chan, uint8_t alert, if (p == NULL) { return (-1); } - memcpy(data, p->data, p->data_len); + memcpy(data, p->data, __min(p->data_len, sizeof(data))); if (str2uchar(argv[1], &data[3]) != 0) { lprintf(LOG_ERR, "Invalid retry: %s", argv[1]); diff --git a/lib/ipmi_sdr.c b/lib/ipmi_sdr.c index 0f6faab..9890132 100644 --- a/lib/ipmi_sdr.c +++ b/lib/ipmi_sdr.c @@ -2086,7 +2086,7 @@ ipmi_sdr_print_sensor_eventonly(struct ipmi_intf *intf, return -1; memset(desc, 0, sizeof (desc)); - snprintf(desc, (sensor->id_code & 0x1f) + 1, "%s", sensor->id_string); + snprintf(desc, sizeof(desc), "%.*s", (sensor->id_code & 0x1f) + 1, sensor->id_string); if (verbose) { printf("Sensor ID : %s (0x%x)\n", @@ -2137,7 +2137,7 @@ ipmi_sdr_print_sensor_mc_locator(struct ipmi_intf *intf, return -1; memset(desc, 0, sizeof (desc)); - snprintf(desc, (mc->id_code & 0x1f) + 1, "%s", mc->id_string); + snprintf(desc, sizeof(desc), "%.*s", (mc->id_code & 0x1f) + 1, mc->id_string); if (verbose == 0) { if (csv_output) @@ -2230,7 +2230,7 @@ ipmi_sdr_print_sensor_generic_locator(struct ipmi_intf *intf, char desc[17]; memset(desc, 0, sizeof (desc)); - snprintf(desc, (dev->id_code & 0x1f) + 1, "%s", dev->id_string); + snprintf(desc, sizeof(desc), "%.*s", (dev->id_code & 0x1f) + 1, dev->id_string); if (!verbose) { if (csv_output) @@ -2287,7 +2287,7 @@ ipmi_sdr_print_sensor_fru_locator(struct ipmi_intf *intf, char desc[17]; memset(desc, 0, sizeof (desc)); - snprintf(desc, (fru->id_code & 0x1f) + 1, "%s", fru->id_string); + snprintf(desc, sizeof(desc), "%.*s", (fru->id_code & 0x1f) + 1, fru->id_string); if (!verbose) { if (csv_output) @@ -2491,35 +2491,43 @@ ipmi_sdr_print_name_from_rawentry(struct ipmi_intf *intf, uint16_t id, int rc =0; char desc[17]; + const char *id_string; + uint8_t id_code; memset(desc, ' ', sizeof (desc)); switch ( type) { case SDR_RECORD_TYPE_FULL_SENSOR: record.full = (struct sdr_record_full_sensor *) raw; - snprintf(desc, (record.full->id_code & 0x1f) +1, "%s", - (const char *)record.full->id_string); + id_code = record.full->id_code; + id_string = record.full->id_string; break; + case SDR_RECORD_TYPE_COMPACT_SENSOR: record.compact = (struct sdr_record_compact_sensor *) raw ; - snprintf(desc, (record.compact->id_code & 0x1f) +1, "%s", - (const char *)record.compact->id_string); + id_code = record.compact->id_code; + id_string = record.compact->id_string; break; + case SDR_RECORD_TYPE_EVENTONLY_SENSOR: record.eventonly = (struct sdr_record_eventonly_sensor *) raw ; - snprintf(desc, (record.eventonly->id_code & 0x1f) +1, "%s", - (const char *)record.eventonly->id_string); - break; + id_code = record.eventonly->id_code; + id_string = record.eventonly->id_string; + break; + case SDR_RECORD_TYPE_MC_DEVICE_LOCATOR: record.mcloc = (struct sdr_record_mc_locator *) raw ; - snprintf(desc, (record.mcloc->id_code & 0x1f) +1, "%s", - (const char *)record.mcloc->id_string); + id_code = record.mcloc->id_code; + id_string = record.mcloc->id_string; break; + default: rc = -1; - break; - } + } + if (!rc) { + snprintf(desc, sizeof(desc), "%.*s", (id_code & 0x1f) + 1, id_string); + } - lprintf(LOG_INFO, "ID: 0x%04x , NAME: %-16s", id, desc); + lprintf(LOG_INFO, "ID: 0x%04x , NAME: %-16s", id, desc); return rc; } diff --git a/lib/ipmi_session.c b/lib/ipmi_session.c index 141f0f4..b9af1fd 100644 --- a/lib/ipmi_session.c +++ b/lib/ipmi_session.c @@ -309,8 +309,10 @@ ipmi_get_session_info(struct ipmi_intf * intf, } else { - memcpy(&session_info, rsp->data, rsp->data_len); - print_session_info(&session_info, rsp->data_len); + memcpy(&session_info, rsp->data, + __min(rsp->data_len, sizeof(session_info))); + print_session_info(&session_info, + __min(rsp->data_len, sizeof(session_info))); } break; @@ -341,8 +343,10 @@ ipmi_get_session_info(struct ipmi_intf * intf, break; } - memcpy(&session_info, rsp->data, rsp->data_len); - print_session_info(&session_info, rsp->data_len); + memcpy(&session_info, rsp->data, + __min(rsp->data_len, sizeof(session_info))); + print_session_info(&session_info, + __min(rsp->data_len, sizeof(session_info))); } while (i <= session_info.session_slot_count); break; -- 2.20.1