Bug 2028932 (CVE-2021-3657) - CVE-2021-3657 isync: buffer overflows due to inadequate handling of extremely large IMAP literals
Summary: CVE-2021-3657 isync: buffer overflows due to inadequate handling of extremely...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-3657
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2028933 2028934
Blocks: 2027980
TreeView+ depends on / blocked
 
Reported: 2021-12-03 18:39 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-02-17 11:32 UTC (History)
2 users (show)

Fixed In Version: isync 1.4.4
Doc Type: If docs needed, set a value
Doc Text:
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.
Clone Of:
Environment:
Last Closed: 2021-12-03 19:09:03 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-12-03 18:39:15 UTC 
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.

Reference:
https://www.openwall.com/lists/oss-security/2021/12/03/1
Comment 1 Guilherme de Almeida Suckevicz 2021-12-03 18:39:32 UTC 
Created isync tracking bugs for this issue:

Affects: epel-all [bug 2028934]
Affects: fedora-all [bug 2028933]
Comment 2 Product Security DevOps Team 2021-12-03 19:09:01 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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