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Resolves: CVE-2023-27535 - fix FTP too eager connection reuse

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This commit is contained in:
Kamil Dudka 2023-03-24 13:24:04 +01:00
parent 2a890c9910
commit bd2517cc9b
2 changed files with 242 additions and 0 deletions
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237
0027-curl-7.76.1-CVE-2023-27535.patch Normal file
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@ -0,0 +1,237 @@
From e8705acd69383c13191c9dd4867d5118e58c54ba Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 6 Oct 2022 00:49:10 +0200
Subject: [PATCH 1/2] strcase: add Curl_timestrcmp
This is a strcmp() alternative function for comparing "secrets",
designed to take the same time no matter the content to not leak
match/non-match info to observers based on how fast it is.
The time this function takes is only a function of the shortest input
string.
Reported-by: Trail of Bits
Closes #9658
Upstream-commit: ed5095ed94281989e103c72e032200b83be37878
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/strcase.c | 22 ++++++++++++++++++++++
lib/strcase.h | 1 +
2 files changed, 23 insertions(+)
diff --git a/lib/strcase.c b/lib/strcase.c
index f932485..c73907d 100644
--- a/lib/strcase.c
+++ b/lib/strcase.c
@@ -261,6 +261,28 @@ bool Curl_safecmp(char *a, char *b)
return !a && !b;
}
+/*
+ * Curl_timestrcmp() returns 0 if the two strings are identical. The time this
+ * function spends is a function of the shortest string, not of the contents.
+ */
+int Curl_timestrcmp(const char *a, const char *b)
+{
+ int match = 0;
+ int i = 0;
+
+ if(a && b) {
+ while(1) {
+ match |= a[i]^b[i];
+ if(!a[i] || !b[i])
+ break;
+ i++;
+ }
+ }
+ else
+ return a || b;
+ return match;
+}
+
/* --- public functions --- */
int curl_strequal(const char *first, const char *second)
diff --git a/lib/strcase.h b/lib/strcase.h
index d245929..11a67a1 100644
--- a/lib/strcase.h
+++ b/lib/strcase.h
@@ -49,5 +49,6 @@ void Curl_strntoupper(char *dest, const char *src, size_t n);
void Curl_strntolower(char *dest, const char *src, size_t n);
bool Curl_safecmp(char *a, char *b);
+int Curl_timestrcmp(const char *first, const char *second);
#endif /* HEADER_CURL_STRCASE_H */
--
2.39.2
From 9cfaea212ff347937a38f6b5d6b885ed8ba1b931 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 9 Mar 2023 17:47:06 +0100
Subject: [PATCH 2/2] ftp: add more conditions for connection reuse
Reported-by: Harry Sintonen
Closes #10730
Upstream-commit: 8f4608468b890dce2dad9f91d5607ee7e9c1aba1
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/ftp.c | 28 ++++++++++++++++++++++++++--
lib/ftp.h | 5 +++++
lib/setopt.c | 2 +-
lib/url.c | 16 +++++++++++++++-
lib/urldata.h | 4 ++--
5 files changed, 49 insertions(+), 6 deletions(-)
diff --git a/lib/ftp.c b/lib/ftp.c
index 9442832..df15bc0 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -4086,6 +4086,8 @@ static CURLcode ftp_disconnect(struct Curl_easy *data,
}
freedirs(ftpc);
+ Curl_safefree(ftpc->account);
+ Curl_safefree(ftpc->alternative_to_user);
Curl_safefree(ftpc->prevpath);
Curl_safefree(ftpc->server_os);
Curl_pp_disconnect(pp);
@@ -4346,11 +4348,31 @@ static CURLcode ftp_setup_connection(struct Curl_easy *data,
{
char *type;
struct FTP *ftp;
+ struct ftp_conn *ftpc = &conn->proto.ftpc;
- data->req.p.ftp = ftp = calloc(sizeof(struct FTP), 1);
+ ftp = calloc(sizeof(struct FTP), 1);
if(NULL == ftp)
return CURLE_OUT_OF_MEMORY;
+ /* clone connection related data that is FTP specific */
+ if(data->set.str[STRING_FTP_ACCOUNT]) {
+ ftpc->account = strdup(data->set.str[STRING_FTP_ACCOUNT]);
+ if(!ftpc->account) {
+ free(ftp);
+ return CURLE_OUT_OF_MEMORY;
+ }
+ }
+ if(data->set.str[STRING_FTP_ALTERNATIVE_TO_USER]) {
+ ftpc->alternative_to_user =
+ strdup(data->set.str[STRING_FTP_ALTERNATIVE_TO_USER]);
+ if(!ftpc->alternative_to_user) {
+ Curl_safefree(ftpc->account);
+ free(ftp);
+ return CURLE_OUT_OF_MEMORY;
+ }
+ }
+ data->req.p.ftp = ftp;
+
ftp->path = &data->state.up.path[1]; /* don't include the initial slash */
/* FTP URLs support an extension like ";type=<typecode>" that
@@ -4385,7 +4407,9 @@ static CURLcode ftp_setup_connection(struct Curl_easy *data,
/* get some initial data into the ftp struct */
ftp->transfer = PPTRANSFER_BODY;
ftp->downloadsize = 0;
- conn->proto.ftpc.known_filesize = -1; /* unknown size for now */
+ ftpc->known_filesize = -1; /* unknown size for now */
+ ftpc->use_ssl = data->set.use_ssl;
+ ftpc->ccc = data->set.ftp_ccc;
return CURLE_OK;
}
diff --git a/lib/ftp.h b/lib/ftp.h
index 7f6f432..3f33e27 100644
--- a/lib/ftp.h
+++ b/lib/ftp.h
@@ -115,6 +115,8 @@ struct FTP {
struct */
struct ftp_conn {
struct pingpong pp;
+ char *account;
+ char *alternative_to_user;
char *entrypath; /* the PWD reply when we logged on */
char *file; /* url-decoded file name (or path) */
char **dirs; /* realloc()ed array for path components */
@@ -144,6 +146,9 @@ struct ftp_conn {
ftpstate state; /* always use ftp.c:state() to change state! */
ftpstate state_saved; /* transfer type saved to be reloaded after
data connection is established */
+ unsigned char use_ssl; /* if AUTH TLS is to be attempted etc, for FTP or
+ IMAP or POP3 or others! (type: curl_usessl)*/
+ unsigned char ccc; /* ccc level for this connection */
curl_off_t retr_size_saved; /* Size of retrieved file saved */
char *server_os; /* The target server operating system. */
curl_off_t known_filesize; /* file size is different from -1, if wildcard
diff --git a/lib/setopt.c b/lib/setopt.c
index 3339a67..6fc111d 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -2264,7 +2264,7 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
arg = va_arg(param, long);
if((arg < CURLUSESSL_NONE) || (arg >= CURLUSESSL_LAST))
return CURLE_BAD_FUNCTION_ARGUMENT;
- data->set.use_ssl = (curl_usessl)arg;
+ data->set.use_ssl = (unsigned char)arg;
break;
case CURLOPT_SSL_OPTIONS:
diff --git a/lib/url.c b/lib/url.c
index 61ba832..4e21838 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -1325,10 +1325,24 @@ ConnectionExists(struct Curl_easy *data,
}
}
- if(get_protocol_family(needle->handler) == PROTO_FAMILY_SSH) {
+#ifdef USE_SSH
+ else if(get_protocol_family(needle->handler) == PROTO_FAMILY_SSH) {
if(!ssh_config_matches(needle, check))
continue;
}
+#endif
+#ifndef CURL_DISABLE_FTP
+ else if(get_protocol_family(needle->handler) & PROTO_FAMILY_FTP) {
+ /* Also match ACCOUNT, ALTERNATIVE-TO-USER, USE_SSL and CCC options */
+ if(Curl_timestrcmp(needle->proto.ftpc.account,
+ check->proto.ftpc.account) ||
+ Curl_timestrcmp(needle->proto.ftpc.alternative_to_user,
+ check->proto.ftpc.alternative_to_user) ||
+ (needle->proto.ftpc.use_ssl != check->proto.ftpc.use_ssl) ||
+ (needle->proto.ftpc.ccc != check->proto.ftpc.ccc))
+ continue;
+ }
+#endif
if((needle->handler->flags&PROTOPT_SSL)
#ifndef CURL_DISABLE_PROXY
diff --git a/lib/urldata.h b/lib/urldata.h
index 9d9ca92..4e2f5b9 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1749,8 +1749,6 @@ struct UserDefined {
void *ssh_keyfunc_userp; /* custom pointer to callback */
enum CURL_NETRC_OPTION
use_netrc; /* defined in include/curl.h */
- curl_usessl use_ssl; /* if AUTH TLS is to be attempted etc, for FTP or
- IMAP or POP3 or others! */
long new_file_perms; /* Permissions to use when creating remote files */
long new_directory_perms; /* Permissions to use when creating remote dirs */
long ssh_auth_types; /* allowed SSH auth types */
@@ -1793,6 +1791,8 @@ struct UserDefined {
CURLU *uh; /* URL handle for the current parsed URL */
void *trailer_data; /* pointer to pass to trailer data callback */
curl_trailer_callback trailer_callback; /* trailing data callback */
+ unsigned char use_ssl; /* if AUTH TLS is to be attempted etc, for FTP or
+ IMAP or POP3 or others! (type: curl_usessl)*/
BIT(is_fread_set); /* has read callback been set to non-NULL? */
BIT(is_fwrite_set); /* has write callback been set to non-NULL? */
BIT(free_referer); /* set TRUE if 'referer' points to a string we
--
2.39.2

5
curl.spec
View File

@ -80,6 +80,9 @@ Patch25: 0025-curl-7.76.1-CVE-2023-27533.patch
# fix SFTP path ~ resolving discrepancy (CVE-2023-27534)
Patch26: 0026-curl-7.76.1-CVE-2023-27534.patch
# fix FTP too eager connection reuse (CVE-2023-27535)
Patch27: 0027-curl-7.76.1-CVE-2023-27535.patch
# patch making libcurl multilib ready
Patch101: 0101-curl-7.32.0-multilib.patch
@ -280,6 +283,7 @@ be installed.
%patch24 -p1
%patch25 -p1
%patch26 -p1
%patch27 -p1
# Fedora patches
%patch101 -p1
@ -506,6 +510,7 @@ rm -f ${RPM_BUILD_ROOT}%{_libdir}/libcurl.la
%changelog
* Fri Mar 24 2023 Kamil Dudka <kdudka@redhat.com> - 7.76.1-24
- fix FTP too eager connection reuse (CVE-2023-27535)
- fix SFTP path ~ resolving discrepancy (CVE-2023-27534)
- fix TELNET option IAC injection (CVE-2023-27533)