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fru, sdr: Fix id_string buffer overflows

Browse Source 
Final part of the fixes for CVE-2020-5208, see
https://github.com/ipmitool/ipmitool/security/advisories/GHSA-g659-9qxw-p7cp

9 variants of stack buffer overflow when parsing `id_string` field of
SDR records returned from `CMD_GET_SDR` command.

SDR record structs have an `id_code` field, and an `id_string` `char`
array.

The length of `id_string` is calculated as `(id_code & 0x1f) + 1`,
which can be larger than expected 16 characters (if `id_code = 0xff`,
then length will be `(0xff & 0x1f) + 1 = 32`).

In numerous places, this can cause stack buffer overflow when copying
into fixed buffer of size `17` bytes from this calculated length.
This commit is contained in:
Chrostoper Ertl 2019-11-28 17:13:45 +00:00 committed by Alexander Amelkin
parent d45572d71e
commit 7ccea283dd
No known key found for this signature in database
GPG Key ID: E893587B5B74178D
2 changed files with 25 additions and 17 deletions
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2
lib/ipmi_fru.c
View File

@ -3078,7 +3078,7 @@ 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);

36
lib/ipmi_sdr.c
View File

@ -2254,7 +2254,7 @@ 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",
@ -2303,7 +2303,7 @@ ipmi_sdr_print_sensor_mc_locator(struct sdr_record_mc_locator *mc)
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)
@ -2394,7 +2394,7 @@ ipmi_sdr_print_sensor_generic_locator(struct sdr_record_generic_locator *dev)
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)
@ -2449,7 +2449,7 @@ ipmi_sdr_print_sensor_fru_locator(struct sdr_record_fru_locator *fru)
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)
@ -2634,35 +2634,43 @@ ipmi_sdr_print_name_from_rawentry(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);
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;
}