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47 lines
1.7 KiB
47 lines
1.7 KiB
From 3dbac7fb8b39a4f9aa871401d9d2790f0583ba01 Mon Sep 17 00:00:00 2001 |
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From: Daniel Stenberg <daniel@haxx.se> |
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Date: Sat, 12 Jun 2021 18:25:15 +0200 |
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Subject: [PATCH] telnet: fix option parser to not send uninitialized contents |
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CVE-2021-22925 |
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Reported-by: Red Hat Product Security |
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Bug: https://curl.se/docs/CVE-2021-22925.html |
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Upstream-commit: 894f6ec730597eb243618d33cc84d71add8d6a8a |
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Signed-off-by: Kamil Dudka <kdudka@redhat.com> |
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--- |
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lib/telnet.c | 17 +++++++++++------ |
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1 file changed, 11 insertions(+), 6 deletions(-) |
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diff --git a/lib/telnet.c b/lib/telnet.c |
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index fdd137f..567c22c 100644 |
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--- a/lib/telnet.c |
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+++ b/lib/telnet.c |
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@@ -922,12 +922,17 @@ static void suboption(struct Curl_easy *data) |
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size_t tmplen = (strlen(v->data) + 1); |
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/* Add the variable only if it fits */ |
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if(len + tmplen < (int)sizeof(temp)-6) { |
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- if(sscanf(v->data, "%127[^,],%127s", varname, varval) == 2) { |
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- msnprintf((char *)&temp[len], sizeof(temp) - len, |
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- "%c%s%c%s", CURL_NEW_ENV_VAR, varname, |
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- CURL_NEW_ENV_VALUE, varval); |
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- len += tmplen; |
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- } |
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+ int rv; |
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+ char sep[2] = ""; |
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+ varval[0] = 0; |
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+ rv = sscanf(v->data, "%127[^,]%1[,]%127s", varname, sep, varval); |
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+ if(rv == 1) |
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+ len += msnprintf((char *)&temp[len], sizeof(temp) - len, |
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+ "%c%s", CURL_NEW_ENV_VAR, varname); |
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+ else if(rv >= 2) |
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+ len += msnprintf((char *)&temp[len], sizeof(temp) - len, |
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+ "%c%s%c%s", CURL_NEW_ENV_VAR, varname, |
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+ CURL_NEW_ENV_VALUE, varval); |
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} |
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} |
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msnprintf((char *)&temp[len], sizeof(temp) - len, |
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-- |
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2.31.1 |
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