From 9452be87181a6e83cfcc768b3ed8321763db50e4 Mon Sep 17 00:00:00 2001 From: Chrostoper Ertl Date: Thu, 28 Nov 2019 16:56:38 +0000 Subject: [PATCH] channel: Fix buffer overflow 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 `ipmi_get_channel_cipher_suites` function does not properly check the final response’s `data_len`, which can lead to stack buffer overflow on the final copy. --- lib/ipmi_channel.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lib/ipmi_channel.c b/lib/ipmi_channel.c index a6a6a42..433c4d3 100644 --- a/lib/ipmi_channel.c +++ b/lib/ipmi_channel.c @@ -498,7 +498,10 @@ ipmi_get_channel_cipher_suites(struct ipmi_intf *intf, lprintf(LOG_ERR, "Unable to Get Channel Cipher Suites"); return -1; } - if (rsp->ccode || rsp->data_len < 1) { + if (rsp->ccode + || rsp->data_len < 1 + || rsp->data_len > sizeof(uint8_t) + MAX_CIPHER_SUITE_DATA_LEN) + { lprintf(LOG_ERR, "Get Channel Cipher Suites failed: %s", val2str(rsp->ccode, completion_code_vals)); return -1;