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Fix redis-cli / redis-sential overflow on some platforms (CVE-2021-32762) (#9587)

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The redis-cli command line tool and redis-sentinel service may be vulnerable
to integer overflow when parsing specially crafted large multi-bulk network
replies. This is a result of a vulnerability in the underlying hiredis
library which does not perform an overflow check before calling the calloc()
heap allocation function.

This issue only impacts systems with heap allocators that do not perform their
own overflow checks. Most modern systems do and are therefore not likely to
be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator
which is also not vulnerable.

Co-authored-by: Yossi Gottlieb <yossigo@gmail.com>
This commit is contained in:
Oran Agra 2021-10-04 12:10:17 +03:00 committed by GitHub
parent 7cb89a5a1c
commit 0215324a66
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 15 additions and 0 deletions
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1
deps/hiredis/hiredis.c vendored
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@ -174,6 +174,7 @@ static void *createArrayObject(const redisReadTask *task, size_t elements) {
return NULL;
if (elements > 0) {
if (SIZE_MAX / sizeof(redisReply*) < elements) return NULL; /* Don't overflow */
r->element = hi_calloc(elements,sizeof(redisReply*));
if (r->element == NULL) {
freeReplyObject(r);

14
deps/hiredis/test.c vendored
View File

@ -498,6 +498,20 @@ static void test_reply_reader(void) {
freeReplyObject(reply);
redisReaderFree(reader);
test("Multi-bulk never overflows regardless of maxelements: ");
size_t bad_mbulk_len = (SIZE_MAX / sizeof(void *)) + 3;
char bad_mbulk_reply[100];
snprintf(bad_mbulk_reply, sizeof(bad_mbulk_reply), "*%llu\r\n+asdf\r\n",
(unsigned long long) bad_mbulk_len);
reader = redisReaderCreate();
reader->maxelements = 0; /* Don't rely on default limit */
redisReaderFeed(reader, bad_mbulk_reply, strlen(bad_mbulk_reply));
ret = redisReaderGetReply(reader,&reply);
test_cond(ret == REDIS_ERR && strcasecmp(reader->errstr, "Out of memory") == 0);
freeReplyObject(reply);
redisReaderFree(reader);
#if LLONG_MAX > SIZE_MAX
test("Set error when array > SIZE_MAX: ");
reader = redisReaderCreate();