diff options
Diffstat (limited to 'debian/patches/CVE-2020-5208_6-fru-sdr-Fix-id_string-buffer-overflows.patch')
| -rw-r--r-- | debian/patches/CVE-2020-5208_6-fru-sdr-Fix-id_string-buffer-overflows.patch | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/debian/patches/CVE-2020-5208_6-fru-sdr-Fix-id_string-buffer-overflows.patch b/debian/patches/CVE-2020-5208_6-fru-sdr-Fix-id_string-buffer-overflows.patch new file mode 100644 index 0000000..03451ed --- /dev/null +++ b/debian/patches/CVE-2020-5208_6-fru-sdr-Fix-id_string-buffer-overflows.patch @@ -0,0 +1,134 @@ +From 7ccea283dd62a05a320c1921e3d8d71a87772637 Mon Sep 17 00:00:00 2001 +From: Chrostoper Ertl <chertl@microsoft.com> +Date: Thu, 28 Nov 2019 17:13:45 +0000 +Subject: [PATCH 6/6] fru, sdr: Fix id_string buffer overflows + +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. +--- + lib/ipmi_fru.c | 2 +- + lib/ipmi_sdr.c | 40 ++++++++++++++++++++++++---------------- + 2 files changed, 25 insertions(+), 17 deletions(-) + +Index: ipmitool-1.8.18/lib/ipmi_fru.c +=================================================================== +--- ipmitool-1.8.18.orig/lib/ipmi_fru.c ++++ ipmitool-1.8.18/lib/ipmi_fru.c +@@ -3062,7 +3062,7 @@ ipmi_fru_print(struct ipmi_intf * intf, + 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); + +Index: ipmitool-1.8.18/lib/ipmi_sdr.c +=================================================================== +--- ipmitool-1.8.18.orig/lib/ipmi_sdr.c ++++ ipmitool-1.8.18/lib/ipmi_sdr.c +@@ -2084,7 +2084,7 @@ ipmi_sdr_print_sensor_eventonly(struct i + 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", +@@ -2135,7 +2135,7 @@ ipmi_sdr_print_sensor_mc_locator(struct + 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) +@@ -2228,7 +2228,7 @@ ipmi_sdr_print_sensor_generic_locator(st + 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) +@@ -2285,7 +2285,7 @@ ipmi_sdr_print_sensor_fru_locator(struct + 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) +@@ -2489,35 +2489,43 @@ ipmi_sdr_print_name_from_rawentry(struct + + 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; + } + |