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Mageia 7, 8 MGASA-2021-0196 Critical Rcp Manipulation Issue

An issue was discovered in rcp in MIT krb5-appl through 1.0.3. Due to the rcp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the rcp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious rcp server (or . MGASA-2021-0196 - Updated krb5-appl packages fix security vulnerabilities Publication date: 23 Apr 2021 URL: https://advisories.mageia.org/MGASA-2021-0196.html Type: security Affected Mageia releases: 7, 8 CVE: CVE-2019-25017, CVE-2019-25018 An issue was discovered in rcp in MIT krb5-appl through 1.0.3. Due to the rcp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the rcp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious rcp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the rcp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file). This issue is similar to CVE-2019-6111 and CVE-2019-7283 (CVE-2019-25017). In the rcp client in MIT krb5-appl through 1.0.3 malicious servers could bypass intended access restrictions via the filename of . or an empty filename, similar to CVE-2018-20685 and CVE-2019-7282. The impact is modifying the permissions of the target directory on the client side (CVE-2019-25018). References: - https://bugs.mageia.org/show_bug.cgi?id=28460 - https://lists.suse.com/pipermail/sle-security-updates/2021-February/008353.html - https://www.cve.org/CVERecord?id=CVE-2019-25017 - https://www.cve.org/CVERecord?id=CVE-2019-25018 SRPMS: - 8/core/krb5-appl-1.0.3-13.1.mga8 - 7/core/krb5-appl-1.0.3-10.2.mga7 . Mageia's MGASA-2021-0215 tackles significant vulnerabilities within the libxml2 library, bolstering data integrity measures.. Krb5-applSecurity,Mageia Security Advisory,Rcp File Access,File Security Risks. . Severity: Critical. LinuxSecurity.com Team

Apr 23, 2021 •Critical Mageia