Vulnerability CVE-2021-42574
Published: 2021-11-01

Description:
An issue was discovered in the Bidirectional Algorithm in the Unicode Specification through 14.0. It permits the visual reordering of characters via control sequences, which can be used to craft source code that renders different logic than the logical ordering of tokens ingested by compilers and interpreters. Adversaries can leverage this to encode source code for compilers accepting Unicode such that targeted vulnerabilities are introduced invisibly to human reviewers.

Type:

CWE-94

 (Improper Control of Generation of Code ('Code Injection'))

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Unicode -> Unicode 

 References:
https://trojansource.codes
http://www.unicode.org/versions/Unicode14.0.0/
http://www.openwall.com/lists/oss-security/2021/11/01/1
http://www.openwall.com/lists/oss-security/2021/11/01/4
http://www.openwall.com/lists/oss-security/2021/11/01/5
http://www.openwall.com/lists/oss-security/2021/11/01/6
http://www.openwall.com/lists/oss-security/2021/11/02/10
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QUPA37D57VPTDLSXOOGF4UXUEADOC4PQ/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LQNTFF24ROHLVPLUOEISBN3F7QM27L4U/
https://www.kb.cert.org/vuls/id/999008
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