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curl.27751
curl-CVE-2021-22946.patch
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File curl-CVE-2021-22946.patch of Package curl.27751
From 96d71feb27e533a8b337512841a537952916262c Mon Sep 17 00:00:00 2001 From: Patrick Monnerat <patrick@monnerat.net> Date: Wed, 8 Sep 2021 11:56:22 +0200 Subject: [PATCH] ftp,imap,pop3: do not ignore --ssl-reqd In imap and pop3, check if TLS is required even when capabilities request has failed. In ftp, ignore preauthentication (230 status of server greeting) if TLS is required. Bug: https://curl.se/docs/CVE-2021-22946.html CVE-2021-22946 --- lib/ftp.c | 9 ++++--- lib/imap.c | 24 ++++++++---------- lib/pop3.c | 33 +++++++++++------------- tests/data/Makefile.inc | 2 ++ tests/data/test984 | 56 +++++++++++++++++++++++++++++++++++++++++ tests/data/test985 | 54 +++++++++++++++++++++++++++++++++++++++ tests/data/test986 | 53 ++++++++++++++++++++++++++++++++++++++ 7 files changed, 195 insertions(+), 36 deletions(-) create mode 100644 tests/data/test984 create mode 100644 tests/data/test985 create mode 100644 tests/data/test986 Index: curl-7.66.0/lib/ftp.c =================================================================== --- curl-7.66.0.orig/lib/ftp.c +++ curl-7.66.0/lib/ftp.c @@ -2596,9 +2596,12 @@ static CURLcode ftp_statemach_act(struct /* we have now received a full FTP server response */ switch(ftpc->state) { case FTP_WAIT220: - if(ftpcode == 230) - /* 230 User logged in - already! */ - return ftp_state_user_resp(conn, ftpcode, ftpc->state); + if(ftpcode == 230) { + /* 230 User logged in - already! Take as 220 if TLS required. */ + if(data->set.use_ssl <= CURLUSESSL_TRY || + conn->ssl[FIRSTSOCKET].use) + return ftp_state_user_resp(conn, ftpcode, ftpc->state); + } else if(ftpcode != 220) { failf(data, "Got a %03d ftp-server response when 220 was expected", ftpcode); Index: curl-7.66.0/lib/imap.c =================================================================== --- curl-7.66.0.orig/lib/imap.c +++ curl-7.66.0/lib/imap.c @@ -917,22 +917,18 @@ static CURLcode imap_state_capability_re line += wordlen; } } - else if(imapcode == IMAP_RESP_OK) { - if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) { - /* We don't have a SSL/TLS connection yet, but SSL is requested */ - if(imapc->tls_supported) - /* Switch to TLS connection now */ - result = imap_perform_starttls(conn); - else if(data->set.use_ssl == CURLUSESSL_TRY) - /* Fallback and carry on with authentication */ - result = imap_perform_authentication(conn); - else { - failf(data, "STARTTLS not supported."); - result = CURLE_USE_SSL_FAILED; - } + else if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) { + /* PREAUTH is not compatible with STARTTLS. */ + if(imapcode == IMAP_RESP_OK && imapc->tls_supported && !imapc->preauth) { + /* Switch to TLS connection now */ + result = imap_perform_starttls(conn); } - else + else if(data->set.use_ssl <= CURLUSESSL_TRY) result = imap_perform_authentication(conn); + else { + failf(data, "STARTTLS not available."); + result = CURLE_USE_SSL_FAILED; + } } else result = imap_perform_authentication(conn); Index: curl-7.66.0/lib/pop3.c =================================================================== --- curl-7.66.0.orig/lib/pop3.c +++ curl-7.66.0/lib/pop3.c @@ -721,28 +721,23 @@ static CURLcode pop3_state_capa_resp(str } } } - else if(pop3code == '+') { - if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) { - /* We don't have a SSL/TLS connection yet, but SSL is requested */ - if(pop3c->tls_supported) - /* Switch to TLS connection now */ - result = pop3_perform_starttls(conn); - else if(data->set.use_ssl == CURLUSESSL_TRY) - /* Fallback and carry on with authentication */ - result = pop3_perform_authentication(conn); - else { - failf(data, "STLS not supported."); - result = CURLE_USE_SSL_FAILED; - } - } - else - result = pop3_perform_authentication(conn); - } else { /* Clear text is supported when CAPA isn't recognised */ - pop3c->authtypes |= POP3_TYPE_CLEARTEXT; + if(pop3code != '+') + pop3c->authtypes |= POP3_TYPE_CLEARTEXT; - result = pop3_perform_authentication(conn); + if(!data->set.use_ssl || conn->ssl[FIRSTSOCKET].use) + result = pop3_perform_authentication(conn); + else if(pop3code == '+' && pop3c->tls_supported) + /* Switch to TLS connection now */ + result = pop3_perform_starttls(conn); + else if(data->set.use_ssl <= CURLUSESSL_TRY) + /* Fallback and carry on with authentication */ + result = pop3_perform_authentication(conn); + else { + failf(data, "STLS not supported."); + result = CURLE_USE_SSL_FAILED; + } } return result; Index: curl-7.66.0/tests/data/Makefile.inc =================================================================== --- curl-7.66.0.orig/tests/data/Makefile.inc +++ curl-7.66.0/tests/data/Makefile.inc @@ -109,6 +109,8 @@ test936 test937 test938 test939 test940 test945 test946 test947 test948 test949 test950 test951 test952 test953 \ test954 \ \ +test984 test985 test986 \ +\ test1000 test1001 test1002 test1003 test1004 test1005 test1006 test1007 \ test1008 test1009 test1010 test1011 test1012 test1013 test1014 test1015 \ test1016 test1017 test1018 test1019 test1020 test1021 test1022 test1023 \ Index: curl-7.66.0/tests/data/test984 =================================================================== --- /dev/null +++ curl-7.66.0/tests/data/test984 @@ -0,0 +1,56 @@ +<testcase> +<info> +<keywords> +IMAP +STARTTLS +</keywords> +</info> + +# +# Server-side +<reply> +<servercmd> +REPLY CAPABILITY A001 BAD Not implemented +</servercmd> +</reply> + +# +# Client-side +<client> +<features> +SSL +</features> +<server> +imap +</server> + <name> +IMAP require STARTTLS with failing capabilities + </name> + <command> +imap://%HOSTIP:%IMAPPORT/%TESTNUMBER -T log/upload%TESTNUMBER -u user:secret --ssl-reqd +</command> +<file name="log/upload%TESTNUMBER"> +Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST) +From: Fred Foobar <foobar@example.COM> +Subject: afternoon meeting +To: joe@example.com +Message-Id: <B27397-0100000@example.COM> +MIME-Version: 1.0 +Content-Type: TEXT/PLAIN; CHARSET=US-ASCII + +Hello Joe, do you think we can meet at 3:30 tomorrow? +</file> +</client> + +# +# Verify data after the test has been "shot" +<verify> +# 64 is CURLE_USE_SSL_FAILED +<errorcode> +64 +</errorcode> +<protocol> +A001 CAPABILITY +</protocol> +</verify> +</testcase> Index: curl-7.66.0/tests/data/test985 =================================================================== --- /dev/null +++ curl-7.66.0/tests/data/test985 @@ -0,0 +1,54 @@ +<testcase> +<info> +<keywords> +POP3 +STARTTLS +</keywords> +</info> + +# +# Server-side +<reply> +<servercmd> +REPLY CAPA -ERR Not implemented +</servercmd> +<data nocheck="yes"> +From: me@somewhere +To: fake@nowhere + +body + +-- + yours sincerely +</data> +</reply> + +# +# Client-side +<client> +<features> +SSL +</features> +<server> +pop3 +</server> + <name> +POP3 require STARTTLS with failing capabilities + </name> + <command> +pop3://%HOSTIP:%POP3PORT/%TESTNUMBER -u user:secret --ssl-reqd + </command> +</client> + +# +# Verify data after the test has been "shot" +<verify> +# 64 is CURLE_USE_SSL_FAILED +<errorcode> +64 +</errorcode> +<protocol> +CAPA +</protocol> +</verify> +</testcase> Index: curl-7.66.0/tests/data/test986 =================================================================== --- /dev/null +++ curl-7.66.0/tests/data/test986 @@ -0,0 +1,53 @@ +<testcase> +<info> +<keywords> +FTP +STARTTLS +</keywords> +</info> + +# +# Server-side +<reply> +<servercmd> +REPLY welcome 230 Welcome +REPLY AUTH 500 unknown command +</servercmd> +</reply> + +# Client-side +<client> +<features> +SSL +</features> +<server> +ftp +</server> + <name> +FTP require STARTTLS while preauthenticated + </name> +<file name="log/test%TESTNUMBER.txt"> +data + to + see +that FTPS +works + so does it? +</file> + <command> +--ssl-reqd --ftp-ssl-control ftp://%HOSTIP:%FTPPORT/%TESTNUMBER -T log/test%TESTNUMBER.txt -u user:secret +</command> +</client> + +# Verify data after the test has been "shot" +<verify> +# 64 is CURLE_USE_SSL_FAILED +<errorcode> +64 +</errorcode> +<protocol> +AUTH SSL +AUTH TLS +</protocol> +</verify> +</testcase>
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