CVE-2021-3657: security - CVE-2021-3657: multiple buffer overflows in isync/mbsync

• Products
  • Openwall GNU/*/Linux server OS
  • Linux Kernel Runtime Guard
  • John the Ripper password cracker
    • Free & Open Source for any platform
    • in the cloud
    • Pro for Linux
    • Pro for macOS
  • Wordlists for password cracking
  • passwdqc policy enforcement
    • Free & Open Source for Unix
    • Pro for Windows (Active Directory)
  • yescrypt KDF & password hashing
  • yespower Proof-of-Work (PoW)
  • crypt_blowfish password hashing
  • phpass ditto in PHP
  • tcb better password shadowing
  • Pluggable Authentication Modules
  • scanlogd port scan detector
  • popa3d tiny POP3 daemon
  • blists web interface to mailing lists
  • msulogin single user mode login
  • php_mt_seed mt_rand() cracker
• Services
• Publications
  • Articles
  • Presentations
• Resources
  • Mailing lists
  • Community wiki
  • Source code repositories (GitHub)
  • Source code repositories (CVSweb)
  • File archive & mirrors
  • How to verify digital signatures
  • OVE IDs
• What’s new

[<prev] [next>] [day] [month] [year] [list]

Date: Fri, 3 Dec 2021 12:24:32 +0100 From: Oswald Buddenhagen <oswald.buddenhagen@…de> To: isync-devel@…ts.sourceforge.net Cc: oss-security@…ts.openwall.com Subject: CVE-2021-3657: multiple buffer overflows in isync/mbsync

description:

A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution.

mitigation:

upgrade to the freshly released v1.4.4 available from https://sourceforge.net/projects/isync/files/isync/ , or apply the matching attached patch. note that while a patch for v1.3.x is provided, no upstream release will be made any more.

details:

i’m not sure it’s actually possible to pull off RCE with these. a non-server attacker would be additionally impaired by message size limitations and being unable to predict the exact size of the headers stored in the box, so they would likely need an account on the same liberally configured system, apart from knowing to target mbsync.

View attachment "CVE-2021-3657-buffer-overflows-on-big-1.4.patch" of type "text/x-diff" (7190 bytes)

View attachment "CVE-2021-3657-buffer-overflows-on-big-1.3.patch" of type "text/x-diff" (5489 bytes)

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.