From ceebf5998b71e11c81133680560b498977d3d3cd Mon Sep 17 00:00:00 2001 From: Chrostoper Ertl Date: Thu, 28 Nov 2019 17:06:39 +0000 Subject: [PATCH] lanp: Fix buffer overflows in get_lan_param_select MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Partial fix for CVE-2020-5208, see https://github.com/ipmitool/ipmitool/security/advisories/GHSA-g659-9qxw-p7cp The `get_lan_param_select` function is missing a validation check on the response’s `data_len`, which it then returns to caller functions, where stack buffer overflow can occur. [Retrieve from: https://github.com/ipmitool/ipmitool/commit/d45572d71e70840e0d4c50bf48218492b79c1a10] Signed-off-by: Heiko Thiery --- lib/ipmi_lanp.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) 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]); -- 2.20.1