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From 16b10ba5d3a368cd0ed90e9789553c306f1136a6 Mon Sep 17 00:00:00 2001
From: Chrostoper Ertl <chertl@microsoft.com>
Date: Thu, 28 Nov 2019 16:44:18 +0000
Subject: [PATCH 2/6] fru: Fix buffer overflow in ipmi_spd_print_fru
Partial fix for CVE-2020-5208, see
https://github.com/ipmitool/ipmitool/security/advisories/GHSA-g659-9qxw-p7cp
The `ipmi_spd_print_fru` function has a similar issue as the one fixed
by the previous commit in `read_fru_area_section`. An initial request is
made to get the `fru.size`, which is used as the size for the allocation
of `spd_data`. Inside a loop, further requests are performed to get the
copy sizes which are not checked before being used as the size for a
copy into the buffer.
Upstream-Status: Backport[https://github.com/ipmitool/ipmitool/commit/840fb1cbb4fb365cb9797300e3374d4faefcdb10]
CVE: CVE-2020-5208
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>
---
lib/dimm_spd.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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);
--
2.23.0
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