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From 2c06dc63aa864be8648758e71fa70e3d3f47e06f Mon Sep 17 00:00:00 2001
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From: hopper-vul <118949689+hopper-vul@users.noreply.github.com>
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Date: Wed, 18 Jan 2023 22:14:26 +0800
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Subject: [PATCH] deps(cares): Add str len check in config_sortlist to avoid
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stack overflow (#497)
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In ares_set_sortlist, it calls config_sortlist(..., sortstr) to parse
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the input str and initialize a sortlist configuration.
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However, ares_set_sortlist has not any checks about the validity of the input str.
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It is very easy to create an arbitrary length stack overflow with the unchecked
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`memcpy(ipbuf, str, q-str);` and `memcpy(ipbufpfx, str, q-str);`
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statements in the config_sortlist call, which could potentially cause severe
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security impact in practical programs.
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This commit add necessary check for `ipbuf` and `ipbufpfx` which avoid the
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potential stack overflows.
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fixes #496
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Fix By: @hopper-vul
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Resolves: CVE-2022-4904
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Signed-off-by: rpm-build <rpm-build>
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---
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deps/cares/src/lib/ares_init.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/deps/cares/src/lib/ares_init.c b/deps/cares/src/lib/ares_init.c
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index de5d86c..d5858f6 100644
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--- a/deps/cares/src/lib/ares_init.c
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+++ b/deps/cares/src/lib/ares_init.c
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@@ -2243,6 +2243,8 @@ static int config_sortlist(struct apattern **sortlist, int *nsort,
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q = str;
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while (*q && *q != '/' && *q != ';' && !ISSPACE(*q))
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q++;
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+ if (q-str >= 16)
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+ return ARES_EBADSTR;
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memcpy(ipbuf, str, q-str);
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ipbuf[q-str] = '\0';
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/* Find the prefix */
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@@ -2251,6 +2253,8 @@ static int config_sortlist(struct apattern **sortlist, int *nsort,
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const char *str2 = q+1;
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while (*q && *q != ';' && !ISSPACE(*q))
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q++;
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+ if (q-str >= 32)
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+ return ARES_EBADSTR;
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memcpy(ipbufpfx, str, q-str);
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ipbufpfx[q-str] = '\0';
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str = str2;
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--
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2.39.2
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