From 879f57c3b1ff17b1ca0dbdc8aac9c7a814e876fc Mon Sep 17 00:00:00 2001
|
From: Chrostoper Ertl <chertl@microsoft.com>
|
Date: Thu, 28 Nov 2019 16:44:18 +0000
|
Subject: [PATCH] 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.
|
|
[Retrieve from:
|
https://github.com/ipmitool/ipmitool/commit/840fb1cbb4fb365cb9797300e3374d4faefcdb10]
|
Signed-off-by: Heiko Thiery <heiko.thiery@gmail.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);
|
--
|
2.20.1
|
