CVE-2020-12783

Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

This update for exim fixes the following issues:

Exim was updated to exim-4.94.2

security update (boo#1185631)

• CVE-2020-28007: Link attack in Exim's log directory
• CVE-2020-28008: Assorted attacks in Exim's spool directory
• CVE-2020-28014: Arbitrary PID file creation
• CVE-2020-28011: Heap buffer overflow in queue_run()
• CVE-2020-28010: Heap out-of-bounds write in main()
• CVE-2020-28013: Heap buffer overflow in parse_fix_phrase()
• CVE-2020-28016: Heap out-of-bounds write in parse_fix_phrase()
• CVE-2020-28015: New-line injection into spool header file (local)
• CVE-2020-28012: Missing close-on-exec flag for privileged pipe
• CVE-2020-28009: Integer overflow in get_stdinput()
• CVE-2020-28017: Integer overflow in receive_add_recipient()
• CVE-2020-28020: Integer overflow in receive_msg()
• CVE-2020-28023: Out-of-bounds read in smtp_setup_msg()
• CVE-2020-28021: New-line injection into spool header file (remote)
• CVE-2020-28022: Heap out-of-bounds read and write in extract_option()
• CVE-2020-28026: Line truncation and injection in spool_read_header()
• CVE-2020-28019: Failure to reset function pointer after BDAT error
• CVE-2020-28024: Heap buffer underflow in smtp_ungetc()
• CVE-2020-28018: Use-after-free in tls-openssl.c
• CVE-2020-28025: Heap out-of-bounds read in pdkim_finish_bodyhash()

update to exim-4.94.1

• Fix security issue in BDAT state confusion. Ensure we reset known-good where we know we need to not be reading BDAT data, as a general case fix, and move the places where we switch to BDAT mode until after various protocol state checks. Fixes CVE-2020-BDATA reported by Qualys.
• Fix security issue in SMTP verb option parsing (CVE-2020-EXOPT)
• Fix security issue with too many recipients on a message (to remove a known security problem if someone does set recipients_max to unlimited, or if local additions add to the recipient list). Fixes CVE-2020-RCPTL reported by Qualys.
• Fix CVE-2020-28016 (PFPZA): Heap out-of-bounds write in parse_fix_phrase()
• Fix security issue CVE-2020-PFPSN and guard against cmdline invoker providing a particularly obnoxious sender full name.
• Fix Linux security issue CVE-2020-SLCWD and guard against PATH_MAX better.

• bring back missing exim_db.8 manual page (fixes boo#1173693)

• bring in changes from current +fixes (lots of taint check fixes)

  • Bug 1329: Fix format of Maildir-format filenames to match other mail- related applications. Previously an 'H' was used where available info says that 'M' should be, so change to match.
  • Bug 2587: Fix pam expansion condition. Tainted values are commonly used as arguments, so an implementation trying to copy these into a local buffer was taking a taint-enforcement trap. Fix by using dynamically created buffers.
  • Bug 2586: Fix listcount expansion operator. Using tainted arguments is reasonable, eg. to count headers. Fix by using dynamically created buffers rather than a local. Do similar fixes for ACL actions 'dcc', 'log_reject_target', 'malware' and 'spam'; the arguments are expanded so could be handling tainted values.
  • Bug 2590: Fix -bi (newaliases). A previous code rearrangement had broken the (no-op) support for this sendmail command. Restore it to doing nothing, silently, and returning good status.

• update to exim 4.94

  • some transports now refuse to use tainted data in constructing their delivery location this WILL BREAK configurations which are not updated accordingly. In particular: any Transport use of $local_user which has been relying upon check_local_user far away in the Router to make it safe, should be updated to replace $local_user with $local_part_data.
  • Attempting to remove, in router or transport, a header name that ends with an asterisk (which is a standards-legal name) will now result in all headers named starting with the string…

This update for exim fixes the following issues:

exim was updated to 4.94.2:

security update (boo#1185631)

• CVE-2020-28007: Link attack in Exim's log directory
• CVE-2020-28008: Assorted attacks in Exim's spool directory
• CVE-2020-28014: Arbitrary PID file creation
• CVE-2020-28011: Heap buffer overflow in queue_run()
• CVE-2020-28010: Heap out-of-bounds write in main()
• CVE-2020-28013: Heap buffer overflow in parse_fix_phrase()
• CVE-2020-28016: Heap out-of-bounds write in parse_fix_phrase()
• CVE-2020-28015: New-line injection into spool header file (local)
• CVE-2020-28012: Missing close-on-exec flag for privileged pipe
• CVE-2020-28009: Integer overflow in get_stdinput()
• CVE-2020-28017: Integer overflow in receive_add_recipient()
• CVE-2020-28020: Integer overflow in receive_msg()
• CVE-2020-28023: Out-of-bounds read in smtp_setup_msg()
• CVE-2020-28021: New-line injection into spool header file (remote)
• CVE-2020-28022: Heap out-of-bounds read and write in extract_option()
• CVE-2020-28026: Line truncation and injection in spool_read_header()
• CVE-2020-28019: Failure to reset function pointer after BDAT error
• CVE-2020-28024: Heap buffer underflow in smtp_ungetc()
• CVE-2020-28018: Use-after-free in tls-openssl.c
• CVE-2020-28025: Heap out-of-bounds read in pdkim_finish_bodyhash()

update to exim-4.94.1

• Fix security issue in BDAT state confusion. Ensure we reset known-good where we know we need to not be reading BDAT data, as a general case fix, and move the places where we switch to BDAT mode until after various protocol state checks. Fixes CVE-2020-BDATA reported by Qualys.
• Fix security issue in SMTP verb option parsing (CVE-2020-EXOPT)
• Fix security issue with too many recipients on a message (to remove a known security problem if someone does set recipients_max to unlimited, or if local additions add to the recipient list). Fixes CVE-2020-RCPTL reported by Qualys.
• Fix CVE-2020-28016 (PFPZA): Heap out-of-bounds write in parse_fix_phrase()
• Fix security issue CVE-2020-PFPSN and guard against cmdline invoker providing a particularly obnoxious sender full name.
• Fix Linux security issue CVE-2020-SLCWD and guard against PATH_MAX better.

• bring back missing exim_db.8 manual page (fixes boo#1173693)

• bring in changes from current +fixes (lots of taint check fixes)

  • Bug 1329: Fix format of Maildir-format filenames to match other mail- related applications. Previously an 'H' was used where available info says that 'M' should be, so change to match.
  • Bug 2587: Fix pam expansion condition. Tainted values are commonly used as arguments, so an implementation trying to copy these into a local buffer was taking a taint-enforcement trap. Fix by using dynamically created buffers.
  • Bug 2586: Fix listcount expansion operator. Using tainted arguments is reasonable, eg. to count headers. Fix by using dynamically created buffers rather than a local. Do similar fixes for ACL actions 'dcc', 'log_reject_target', 'malware' and 'spam'; the arguments are expanded so could be handling tainted values.
  • Bug 2590: Fix -bi (newaliases). A previous code rearrangement had broken the (no-op) support for this sendmail command. Restore it to doing nothing, silently, and returning good status.

update to exim 4.94

• some transports now refuse to use tainted data in constructing their delivery location this WILL BREAK configurations which are not updated accordingly. In particular: any Transport use of $local_user which has been relying upon check_local_user far away in the Router to make it safe, should be updated to replace $local_user with $local_part_data.
• Attempting to remove, in router or transport, a header name that ends with an asterisk (which is a standards-legal name) will now result in all headers named starting with the string before…

This update for exim fixes the following issues:

Exim was updated to exim-4.94.2

security update (boo#1185631)

• CVE-2020-28007: Link attack in Exim's log directory
• CVE-2020-28008: Assorted attacks in Exim's spool directory
• CVE-2020-28014: Arbitrary PID file creation
• CVE-2020-28011: Heap buffer overflow in queue_run()
• CVE-2020-28010: Heap out-of-bounds write in main()
• CVE-2020-28013: Heap buffer overflow in parse_fix_phrase()
• CVE-2020-28016: Heap out-of-bounds write in parse_fix_phrase()
• CVE-2020-28015: New-line injection into spool header file (local)
• CVE-2020-28012: Missing close-on-exec flag for privileged pipe
• CVE-2020-28009: Integer overflow in get_stdinput()
• CVE-2020-28017: Integer overflow in receive_add_recipient()
• CVE-2020-28020: Integer overflow in receive_msg()
• CVE-2020-28023: Out-of-bounds read in smtp_setup_msg()
• CVE-2020-28021: New-line injection into spool header file (remote)
• CVE-2020-28022: Heap out-of-bounds read and write in extract_option()
• CVE-2020-28026: Line truncation and injection in spool_read_header()
• CVE-2020-28019: Failure to reset function pointer after BDAT error
• CVE-2020-28024: Heap buffer underflow in smtp_ungetc()
• CVE-2020-28018: Use-after-free in tls-openssl.c
• CVE-2020-28025: Heap out-of-bounds read in pdkim_finish_bodyhash()

update to exim-4.94.1

• Fix security issue in BDAT state confusion. Ensure we reset known-good where we know we need to not be reading BDAT data, as a general case fix, and move the places where we switch to BDAT mode until after various protocol state checks. Fixes CVE-2020-BDATA reported by Qualys.
• Fix security issue in SMTP verb option parsing (CVE-2020-EXOPT)
• Fix security issue with too many recipients on a message (to remove a known security problem if someone does set recipients_max to unlimited, or if local additions add to the recipient list). Fixes CVE-2020-RCPTL reported by Qualys.
• Fix CVE-2020-28016 (PFPZA): Heap out-of-bounds write in parse_fix_phrase()
• Fix security issue CVE-2020-PFPSN and guard against cmdline invoker providing a particularly obnoxious sender full name.
• Fix Linux security issue CVE-2020-SLCWD and guard against PATH_MAX better.

• bring back missing exim_db.8 manual page (fixes boo#1173693)

• bring in changes from current +fixes (lots of taint check fixes)

  • Bug 1329: Fix format of Maildir-format filenames to match other mail- related applications. Previously an 'H' was used where available info says that 'M' should be, so change to match.
  • Bug 2587: Fix pam expansion condition. Tainted values are commonly used as arguments, so an implementation trying to copy these into a local buffer was taking a taint-enforcement trap. Fix by using dynamically created buffers.
  • Bug 2586: Fix listcount expansion operator. Using tainted arguments is reasonable, eg. to count headers. Fix by using dynamically created buffers rather than a local. Do similar fixes for ACL actions 'dcc', 'log_reject_target', 'malware' and 'spam'; the arguments are expanded so could be handling tainted values.
  • Bug 2590: Fix -bi (newaliases). A previous code rearrangement had broken the (no-op) support for this sendmail command. Restore it to doing nothing, silently, and returning good status.

• update to exim 4.94

  • some transports now refuse to use tainted data in constructing their delivery location this WILL BREAK configurations which are not updated accordingly. In particular: any Transport use of $local_user which has been relying upon check_local_user far away in the Router to make it safe, should be updated to replace $local_user with $local_part_data.
  • Attempting to remove, in router or transport, a header name that ends with an asterisk (which is a standards-legal name) will now result in all headers named starting with the string…

These are all security issues fixed in the exim-4.94.2-4.2 package on the GA media of openSUSE Tumbleweed.

It was discovered that Exim incorrectly handled certain inputs. An remote attacker could possibly use this issue to access sensitive information or authentication bypass.