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Independent mail community

2021 April 27

VG

Vadim Goncharov in Independent mail community
ашойта?
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Erick Lee in Independent mail community
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ЕО

Евгений Омельченко... in Independent mail community
А SNS разве умеет получать?
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Erick Lee in Independent mail community
надо допилить
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ЕО

Евгений Омельченко... in Independent mail community
Сорян, я работаю не в Amazon
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Erick Lee in Independent mail community
ну если надо с приемом, можно использовать ses, но это полумеры
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Evgeniy Naumov in Independent mail community
а это публичная инфа?
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Erick Lee in Independent mail community
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EN

Evgeniy Naumov in Independent mail community
спасибо
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2021 May 04

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Vsevolod Stakhov in Independent mail community
Summary
Local vulnerabilities
- CVE-2020-28007: Link attack in Exim's log directory
- CVE-2020-28008: Assorted attacks in Exim's spool directory
- CVE-2020-28014: Arbitrary file creation and clobbering
- CVE-2021-27216: Arbitrary file deletion
- 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()
Remote vulnerabilities
- 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()
Acknowledgments
Timeline
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Vsevolod Stakhov in Independent mail community
HOT BAD
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Vsevolod Stakhov in Independent mail community
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yopp in Independent mail community
нормально
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Vsevolod Stakhov in Independent mail community
некоторые дырки там особенно сочные
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Vsevolod Stakhov in Independent mail community
For example, if we send a mail to the recipient
'"X@localhost\njane@localhost 8192,-1#1\n\n1024* "' (where jane is our
username, and localhost is one of Exim's local_domains), then:

- at line 848, we set flags to 1;

- at line 854, we set len to 8KB;

- at line 858, we decrease p (by 8KB) toward the beginning of the heap;

- at line 859, we read the errors_to string out of big_buffer's bounds;

- finally, we receive our mail, which includes the out-of-bounds
 errors_to string in its "From" and "Return-path:" headers (in this
 example, errors_to contains a fragment of /etc/passwd):
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Denis in Independent mail community
make exim great again?
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Erick Lee in Independent mail community
again?
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Fljúgandi Kettlingur... in Independent mail community
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Erick Lee in Independent mail community
сложно
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2021 May 05

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Denis in Independent mail community
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