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Huawei EulerOS: CVE-2023-29383: shadow security update

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Huawei EulerOS: CVE-2023-29383: shadow security update

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
04/14/2023
Created
07/10/2023
Added
07/10/2023
Modified
07/10/2023

Description

In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails because \n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of \r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that "cat /etc/passwd" shows a rogue user account.

Solution(s)

  • huawei-euleros-2_0_sp9-upgrade-shadow

References

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