Blame SOURCES/httpd-2.4.37-CVE-2020-35452.patch
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diff --git a/modules/aaa/mod_auth_digest.c b/modules/aaa/mod_auth_digest.c
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index b760941..0825b1b 100644
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--- a/modules/aaa/mod_auth_digest.c
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+++ b/modules/aaa/mod_auth_digest.c
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@@ -1422,9 +1422,14 @@ static int check_nonce(request_rec *r, digest_header_rec *resp,
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time_rec nonce_time;
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char tmp, hash[NONCE_HASH_LEN+1];
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- if (strlen(resp->nonce) != NONCE_LEN) {
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+ /* Since the time part of the nonce is a base64 encoding of an
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+ * apr_time_t (8 bytes), it should end with a '=', fail early otherwise.
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+ */
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+ if (strlen(resp->nonce) != NONCE_LEN
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+ || resp->nonce[NONCE_TIME_LEN - 1] != '=') {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01775)
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- "invalid nonce %s received - length is not %d",
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+ "invalid nonce '%s' received - length is not %d "
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+ "or time encoding is incorrect",
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resp->nonce, NONCE_LEN);
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note_digest_auth_failure(r, conf, resp, 1);
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return HTTP_UNAUTHORIZED;
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