UBUNTU-CVE-2023-29383
Dashboard / Vulnerabilities / UBUNTU-CVE-2023-29383
Summary:
Details: 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.
References: https://ubuntu.com/security/CVE-2023-29383, https://github.com/shadow-maint/shadow/pull/687, https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797, https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2023-29383-abusing-linux-chfn-to-misrepresent-etc-passwd/, https://www.cve.org/CVERecord?id=CVE-2023-29383
Affected packages
Package
Name: shadow
Purl: pkg:deb/ubuntu/shadow@1:4.1.5.1-1ubuntu9.5+esm4?arch=source&distro=esm-infra-legacy/trusty
Affected ranges
Type: ECOSYSTEM
Events:
