diff -Nru exim4-4.96/debian/changelog exim4-4.96/debian/changelog
--- exim4-4.96/debian/changelog	2023-08-05 03:28:47.000000000 +0000
+++ exim4-4.96/debian/changelog	2023-10-03 13:35:45.000000000 +0000
@@ -1,3 +1,22 @@
+exim4 (4.96-17ubuntu2) mantic; urgency=medium
+
+  * SECURITY UPDATE: information disclosure
+    - debian/patches/CVE-2023-42114.patch: fix possible OOB read in
+      SPA authenticator
+    - CVE-2023-42114
+  * SECURITY UPDATE: remote code execution
+    - debian/patches/CVE-2023-42115.patch: fix possible OOB write in
+      external authenticator
+    - CVE-2023-42115
+  * SECURITY UPDATE: remote code execution
+    - debian/patches/CVE-2023-42116.patch: fix possible OOB write in
+      SPA authenticator
+    - CVE-2023-42116
+  * debian/patches/CVE-2023-42114_15_16.patch:
+    - use uschar more in spa authenticator
+
+ -- Allen Huang <allen.huang@canonical.com>  Tue, 03 Oct 2023 14:35:45 +0100
+
 exim4 (4.96-17ubuntu1) mantic; urgency=medium
 
   * Merge with Debian unstable (LP: #2030098). Remaining changes:
diff -Nru exim4-4.96/debian/patches/CVE-2023-42114_15_16.patch exim4-4.96/debian/patches/CVE-2023-42114_15_16.patch
--- exim4-4.96/debian/patches/CVE-2023-42114_15_16.patch	1970-01-01 00:00:00.000000000 +0000
+++ exim4-4.96/debian/patches/CVE-2023-42114_15_16.patch	2023-10-03 13:35:45.000000000 +0000
@@ -0,0 +1,232 @@
+From 0519dcfb5f149154a416b54865fd8026abb57791 Mon Sep 17 00:00:00 2001
+From: Jeremy Harris <jgh146exb@wizmail.org>
+Date: Thu, 11 May 2023 18:53:25 +0100
+Subject: [PATCH 2/4] Auths: use uschar more in spa authenticator
+
+---
+ src/src/auths/auth-spa.c | 72 +++++++++++++++++++++-------------------
+ src/src/auths/auth-spa.h |  8 ++---
+ src/src/auths/spa.c      | 13 ++++----
+ 3 files changed, 47 insertions(+), 46 deletions(-)
+
+Index: exim4-4.96/src/auths/auth-spa.c
+===================================================================
+--- exim4-4.96.orig/src/auths/auth-spa.c	2023-10-03 14:35:16.511517725 +0100
++++ exim4-4.96/src/auths/auth-spa.c	2023-10-03 14:35:16.507517793 +0100
+@@ -155,6 +155,9 @@
+    up with a different answer to the one above)
+ */
+ 
++#ifndef MACRO_PREDEF
++
++
+ #define DEBUG_X(a,b) ;
+ 
+ extern int DEBUGLEVEL;
+@@ -1229,21 +1232,21 @@
+ 
+ #define spa_string_add(ptr, header, string) \
+ { \
+-char *p = string; \
++uschar * p = string; \
+ int len = 0; \
+-if (p) len = strlen(p); \
+-spa_bytes_add(ptr, header, (US p), len); \
++if (p) len = Ustrlen(p); \
++spa_bytes_add(ptr, header, p, len); \
+ }
+ 
+ #define spa_unicode_add_string(ptr, header, string) \
+ { \
+-char *p = string; \
+-uschar *b = NULL; \
++uschar * p = string; \
++uschar * b = NULL; \
+ int len = 0; \
+ if (p) \
+   { \
+-  len = strlen(p); \
+-  b = strToUnicode(p); \
++  len = Ustrlen(p); \
++  b = US strToUnicode(CS p); \
+   } \
+ spa_bytes_add(ptr, header, b, len*2); \
+ }
+@@ -1366,15 +1369,15 @@
+ #endif
+ 
+ void
+-spa_build_auth_request (SPAAuthRequest * request, char *user, char *domain)
++spa_build_auth_request (SPAAuthRequest * request, uschar * user, uschar * domain)
+ {
+-char *u = strdup (user);
+-char *p = strchr (u, '@');
++uschar * u = string_copy(user);
++uschar * p = Ustrchr(u, '@');
+ 
+ if (p)
+   {
+   if (!domain)
+-   domain = p + 1;
++    domain = p + 1;
+   *p = '\0';
+   }
+ 
+@@ -1384,7 +1387,6 @@
+ SIVAL (&request->flags, 0, 0x0000b207);      /* have to figure out what these mean */
+ spa_string_add (request, user, u);
+ spa_string_add (request, domain, domain);
+-free (u);
+ }
+ 
+ 
+@@ -1475,16 +1477,16 @@
+ 
+ void
+ spa_build_auth_response (SPAAuthChallenge * challenge,
+-                        SPAAuthResponse * response, char *user,
+-                        char *password)
++                        SPAAuthResponse * response, uschar * user,
++                        uschar * password)
+ {
+ uint8x lmRespData[24];
+ uint8x ntRespData[24];
+ uint32x cf = IVAL(&challenge->flags, 0);
+-char *u = strdup (user);
+-char *p = strchr (u, '@');
+-char *d = NULL;
+-char *domain;
++uschar * u = string_copy(user);
++uschar * p = Ustrchr(u, '@');
++uschar * d = NULL;
++uschar * domain;
+ 
+ if (p)
+   {
+@@ -1492,33 +1494,33 @@
+   *p = '\0';
+   }
+ 
+-else domain = d = strdup((cf & 0x1)?
+-  CCS GetUnicodeString(challenge, uDomain) :
+-  CCS GetString(challenge, uDomain));
++else domain = d = string_copy(cf & 0x1
++  ? CUS GetUnicodeString(challenge, uDomain)
++  : CUS GetString(challenge, uDomain));
+ 
+-spa_smb_encrypt (US password, challenge->challengeData, lmRespData);
+-spa_smb_nt_encrypt (US password, challenge->challengeData, ntRespData);
++spa_smb_encrypt(password, challenge->challengeData, lmRespData);
++spa_smb_nt_encrypt(password, challenge->challengeData, ntRespData);
+ 
+ response->bufIndex = 0;
+ memcpy (response->ident, "NTLMSSP\0\0\0", 8);
+ SIVAL (&response->msgType, 0, 3);
+ 
+-spa_bytes_add (response, lmResponse, lmRespData, (cf & 0x200) ? 24 : 0);
+-spa_bytes_add (response, ntResponse, ntRespData, (cf & 0x8000) ? 24 : 0);
++spa_bytes_add(response, lmResponse, lmRespData, cf & 0x200 ? 24 : 0);
++spa_bytes_add(response, ntResponse, ntRespData, cf & 0x8000 ? 24 : 0);
+ 
+ if (cf & 0x1) {      /* Unicode Text */
+-     spa_unicode_add_string (response, uDomain, domain);
+-     spa_unicode_add_string (response, uUser, u);
+-     spa_unicode_add_string (response, uWks, u);
++     spa_unicode_add_string(response, uDomain, domain);
++     spa_unicode_add_string(response, uUser, u);
++     spa_unicode_add_string(response, uWks, u);
+ } else {             /* OEM Text */
+-     spa_string_add (response, uDomain, domain);
+-     spa_string_add (response, uUser, u);
+-     spa_string_add (response, uWks, u);
++     spa_string_add(response, uDomain, domain);
++     spa_string_add(response, uUser, u);
++     spa_string_add(response, uWks, u);
+ }
+ 
+-spa_string_add (response, sessionKey, NULL);
++spa_string_add(response, sessionKey, NULL);
+ response->flags = challenge->flags;
+-
+-if (d != NULL) free (d);
+-free (u);
+ }
++
++
++#endif   /*!MACRO_PREDEF*/
+Index: exim4-4.96/src/auths/auth-spa.h
+===================================================================
+--- exim4-4.96.orig/src/auths/auth-spa.h	2023-10-03 14:35:16.511517725 +0100
++++ exim4-4.96/src/auths/auth-spa.h	2023-10-03 14:35:16.507517793 +0100
+@@ -79,10 +79,10 @@
+ 
+ void spa_bits_to_base64 (unsigned char *, const unsigned char *, int);
+ int spa_base64_to_bits(char *, int, const char *);
+-void spa_build_auth_response (SPAAuthChallenge *challenge,
+-       SPAAuthResponse *response, char *user, char *password);
+-void spa_build_auth_request (SPAAuthRequest *request, char *user,
+-       char *domain);
++void spa_build_auth_response (SPAAuthChallenge * challenge,
++       SPAAuthResponse * response, uschar * user, uschar * password);
++void spa_build_auth_request (SPAAuthRequest * request, uschar * user,
++       uschar * domain);
+ extern void spa_smb_encrypt (unsigned char * passwd, unsigned char * c8,
+                              unsigned char * p24);
+ extern void spa_smb_nt_encrypt (unsigned char * passwd, unsigned char * c8,
+Index: exim4-4.96/src/auths/spa.c
+===================================================================
+--- exim4-4.96.orig/src/auths/spa.c	2023-10-03 14:35:16.511517725 +0100
++++ exim4-4.96/src/auths/spa.c	2023-10-03 14:35:16.507517793 +0100
+@@ -284,14 +284,13 @@
+ SPAAuthChallenge challenge;
+ SPAAuthResponse  response;
+ char msgbuf[2048];
+-char *domain = NULL;
+-char *username, *password;
++uschar * domain = NULL, * username, * password;
+ 
+ /* Code added by PH to expand the options */
+ 
+ *buffer = 0;    /* Default no message when cancelled */
+ 
+-if (!(username = CS expand_string(ob->spa_username)))
++if (!(username = expand_string(ob->spa_username)))
+   {
+   if (f.expand_string_forcedfail) return CANCELLED;
+   string_format(buffer, buffsize, "expansion of \"%s\" failed in %s "
+@@ -300,7 +299,7 @@
+   return ERROR;
+   }
+ 
+-if (!(password = CS expand_string(ob->spa_password)))
++if (!(password = expand_string(ob->spa_password)))
+   {
+   if (f.expand_string_forcedfail) return CANCELLED;
+   string_format(buffer, buffsize, "expansion of \"%s\" failed in %s "
+@@ -310,7 +309,7 @@
+   }
+ 
+ if (ob->spa_domain)
+-  if (!(domain = CS expand_string(ob->spa_domain)))
++  if (!(domain = expand_string(ob->spa_domain)))
+     {
+     if (f.expand_string_forcedfail) return CANCELLED;
+     string_format(buffer, buffsize, "expansion of \"%s\" failed in %s "
+@@ -330,7 +329,7 @@
+ 
+ DSPA("\n\n%s authenticator: using domain %s\n\n", ablock->name, domain);
+ 
+-spa_build_auth_request(&request, CS username, domain);
++spa_build_auth_request(&request, username, domain);
+ spa_bits_to_base64(US msgbuf, US &request, spa_request_length(&request));
+ 
+ DSPA("\n\n%s authenticator: sending request (%s)\n\n", ablock->name, msgbuf);
+@@ -347,7 +346,7 @@
+ DSPA("\n\n%s authenticator: challenge (%s)\n\n", ablock->name, buffer + 4);
+ spa_base64_to_bits(CS (&challenge), sizeof(challenge), CCS (buffer + 4));
+ 
+-spa_build_auth_response(&challenge, &response, CS username, CS password);
++spa_build_auth_response(&challenge, &response, username, password);
+ spa_bits_to_base64(US msgbuf, US &response, spa_request_length(&response));
+ DSPA("\n\n%s authenticator: challenge response (%s)\n\n", ablock->name, msgbuf);
+ 
diff -Nru exim4-4.96/debian/patches/CVE-2023-42114.patch exim4-4.96/debian/patches/CVE-2023-42114.patch
--- exim4-4.96/debian/patches/CVE-2023-42114.patch	1970-01-01 00:00:00.000000000 +0000
+++ exim4-4.96/debian/patches/CVE-2023-42114.patch	2023-10-03 13:35:45.000000000 +0000
@@ -0,0 +1,77 @@
+From 04107e98d58efb69f7e2d7b81176e5374c7098a3 Mon Sep 17 00:00:00 2001
+From: Jeremy Harris <jgh146exb@wizmail.org>
+Date: Thu, 11 May 2023 21:08:08 +0100
+Subject: [PATCH 4/4] Auths: fix possible OOB read in SPA authenticator.  Bug
+ 3001
+
+---
+ doc/doc-txt/ChangeLog    |  3 +++
+ src/src/auths/auth-spa.c | 36 ++++++++++++++++++++++++++++--------
+ 2 files changed, 31 insertions(+), 8 deletions(-)
+
+Index: exim4-4.96/src/auths/auth-spa.c
+===================================================================
+--- exim4-4.96.orig/src/auths/auth-spa.c	2023-10-03 14:35:21.123441831 +0100
++++ exim4-4.96/src/auths/auth-spa.c	2023-10-03 14:35:21.123441831 +0100
+@@ -1252,15 +1252,10 @@
+ }
+ 
+ 
+-#define GetUnicodeString(structPtr, header) \
+-unicodeToString(((char*)structPtr) + IVAL(&structPtr->header.offset,0) , SVAL(&structPtr->header.len,0)/2)
+-#define GetString(structPtr, header) \
+-toString(((CS structPtr) + IVAL(&structPtr->header.offset,0)), SVAL(&structPtr->header.len,0))
+-
+ #ifdef notdef
+ 
+ #define DumpBuffer(fp, structPtr, header) \
+-dumpRaw(fp,(US structPtr)+IVAL(&structPtr->header.offset,0),SVAL(&structPtr->header.len,0))
++ dumpRaw(fp,(US structPtr)+IVAL(&structPtr->header.offset,0),SVAL(&structPtr->header.len,0))
+ 
+ 
+ static void
+@@ -1324,8 +1319,33 @@
+ return buf;
+ }
+ 
++static inline uschar *
++get_challenge_unistr(SPAAuthChallenge * challenge, SPAStrHeader * hdr)
++{
++int off = IVAL(&hdr->offset, 0);
++int len = SVAL(&hdr->len, 0);
++return off + len < sizeof(SPAAuthChallenge)
++  ? US unicodeToString(CS challenge + off, len/2) : US"";
++}
++
++static inline uschar *
++get_challenge_str(SPAAuthChallenge * challenge, SPAStrHeader * hdr)
++{
++int off = IVAL(&hdr->offset, 0);
++int len = SVAL(&hdr->len, 0);
++return off + len < sizeof(SPAAuthChallenge)
++  ? US toString(CS challenge + off, len) : US"";
++}
++
+ #ifdef notdef
+ 
++#define GetUnicodeString(structPtr, header) \
++ unicodeToString(((char*)structPtr) + IVAL(&structPtr->header.offset,0) , SVAL(&structPtr->header.len,0)/2)
++
++#define GetString(structPtr, header) \
++ toString(((CS structPtr) + IVAL(&structPtr->header.offset,0)), SVAL(&structPtr->header.len,0))
++
++
+ void
+ dumpSmbNtlmAuthRequest (FILE * fp, SPAAuthRequest * request)
+ {
+@@ -1495,8 +1515,8 @@
+   }
+ 
+ else domain = d = string_copy(cf & 0x1
+-  ? CUS GetUnicodeString(challenge, uDomain)
+-  : CUS GetString(challenge, uDomain));
++  ? CUS get_challenge_unistr(challenge, &challenge->uDomain)
++  : CUS get_challenge_str(challenge, &challenge->uDomain));
+ 
+ spa_smb_encrypt(password, challenge->challengeData, lmRespData);
+ spa_smb_nt_encrypt(password, challenge->challengeData, ntRespData);
diff -Nru exim4-4.96/debian/patches/CVE-2023-42115.patch exim4-4.96/debian/patches/CVE-2023-42115.patch
--- exim4-4.96/debian/patches/CVE-2023-42115.patch	1970-01-01 00:00:00.000000000 +0000
+++ exim4-4.96/debian/patches/CVE-2023-42115.patch	2023-10-03 13:35:45.000000000 +0000
@@ -0,0 +1,24 @@
+From 7bb5bc2c6592e062bf0b514cc71afd2d93e2e0dd Mon Sep 17 00:00:00 2001
+From: Jeremy Harris <jgh146exb@wizmail.org>
+Date: Thu, 11 May 2023 18:02:43 +0100
+Subject: [PATCH 1/4] Auths: fix possible OOB write in external authenticator. 
+ Bug 2999
+
+---
+ doc/doc-txt/ChangeLog    | 3 +++
+ src/src/auths/external.c | 2 +-
+ 2 files changed, 4 insertions(+), 1 deletion(-)
+
+Index: exim4-4.96/src/auths/external.c
+===================================================================
+--- exim4-4.96.orig/src/auths/external.c	2023-10-03 14:35:25.851368574 +0100
++++ exim4-4.96/src/auths/external.c	2023-10-03 14:35:25.847368634 +0100
+@@ -103,7 +103,7 @@
+ if (ob->server_param2)
+   {
+   uschar * s = expand_string(ob->server_param2);
+-  auth_vars[expand_nmax] = s;
++  auth_vars[expand_nmax = 1] = s;
+   expand_nstring[++expand_nmax] = s;
+   expand_nlength[expand_nmax] = Ustrlen(s);
+   if (ob->server_param3)
diff -Nru exim4-4.96/debian/patches/CVE-2023-42116.patch exim4-4.96/debian/patches/CVE-2023-42116.patch
--- exim4-4.96/debian/patches/CVE-2023-42116.patch	1970-01-01 00:00:00.000000000 +0000
+++ exim4-4.96/debian/patches/CVE-2023-42116.patch	2023-10-03 13:35:45.000000000 +0000
@@ -0,0 +1,26 @@
+From e17b8b0f19b25a223b0cc41933b881c3a1073e61 Mon Sep 17 00:00:00 2001
+From: Jeremy Harris <jgh146exb@wizmail.org>
+Date: Thu, 11 May 2023 19:31:54 +0100
+Subject: [PATCH 3/4] Auths: fix possible OOB write in SPA authenticator.  Bug
+ 3000
+
+---
+ doc/doc-txt/ChangeLog    | 3 +++
+ src/src/auths/auth-spa.c | 4 +++-
+ 2 files changed, 6 insertions(+), 1 deletion(-)
+
+Index: exim4-4.96/src/auths/auth-spa.c
+===================================================================
+--- exim4-4.96.orig/src/auths/auth-spa.c	2023-10-03 14:35:29.411316399 +0100
++++ exim4-4.96/src/auths/auth-spa.c	2023-10-03 14:35:29.411316399 +0100
+@@ -1214,7 +1214,9 @@
+ 
+ #define spa_bytes_add(ptr, header, buf, count) \
+ { \
+-if (buf && (count) != 0) /* we hate -Wint-in-bool-contex */ \
++if (  buf && (count) != 0	/* we hate -Wint-in-bool-contex */ \
++   && ptr->bufIndex + count < sizeof(ptr->buffer)		\
++   ) \
+   { \
+   SSVAL(&ptr->header.len,0,count); \
+   SSVAL(&ptr->header.maxlen,0,count); \
diff -Nru exim4-4.96/debian/patches/series exim4-4.96/debian/patches/series
--- exim4-4.96/debian/patches/series	2023-08-05 03:28:47.000000000 +0000
+++ exim4-4.96/debian/patches/series	2023-10-03 13:35:45.000000000 +0000
@@ -39,3 +39,7 @@
 75_77-GnuTLS-fix-crash-with-tls_dhparam-none.patch
 90_localscan_dlopen.dpatch
 fix_smtp_banner.patch
+CVE-2023-42114_15_16.patch
+CVE-2023-42114.patch
+CVE-2023-42115.patch
+CVE-2023-42116.patch