In Perl through 5.26.2, the Archive::Tar module allows remote attackers to bypass a directory-traversal protection mechanism, and overwrite arbitrary files, via an archive file containing a symlink and a regular file with the same name.
Weakness
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ubuntu_linux | Canonical | 12.04 (including) | 12.04 (including) |
| Ubuntu_linux | Canonical | 14.04 (including) | 14.04 (including) |
| Ubuntu_linux | Canonical | 16.04 (including) | 16.04 (including) |
| Ubuntu_linux | Canonical | 17.10 (including) | 17.10 (including) |
| Ubuntu_linux | Canonical | 18.04 (including) | 18.04 (including) |
| Red Hat Enterprise Linux 7 | RedHat | perl-Archive-Tar-0:1.92-3.el7 | * |
| Perl | Ubuntu | artful | * |
| Perl | Ubuntu | bionic | * |
| Perl | Ubuntu | esm-infra-legacy/trusty | * |
| Perl | Ubuntu | esm-infra/bionic | * |
| Perl | Ubuntu | esm-infra/xenial | * |
| Perl | Ubuntu | trusty | * |
| Perl | Ubuntu | trusty/esm | * |
| Perl | Ubuntu | upstream | * |
| Perl | Ubuntu | xenial | * |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/132.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/35.html
- https://cwe.mitre.org/data/definitions/76.html
References
- http://seclists.org/fulldisclosure/2019/Mar/49
- http://www.securityfocus.com/bid/104423
- http://www.securitytracker.com/id/1041048
- https://access.redhat.com/errata/RHSA-2019:2097
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900834
- https://seclists.org/bugtraq/2019/Mar/42
- https://security.netapp.com/advisory/ntap-20180927-0001/
- https://support.apple.com/kb/HT209600
- https://usn.ubuntu.com/3684-1/
- https://usn.ubuntu.com/3684-2/
- https://www.debian.org/security/2018/dsa-4226
- https://www.oracle.com/security-alerts/cpujul2020.html
- http://seclists.org/fulldisclosure/2019/Mar/49
- http://www.securityfocus.com/bid/104423
- http://www.securitytracker.com/id/1041048
- https://access.redhat.com/errata/RHSA-2019:2097
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900834
- https://seclists.org/bugtraq/2019/Mar/42
- https://security.netapp.com/advisory/ntap-20180927-0001/
- https://support.apple.com/kb/HT209600
- https://usn.ubuntu.com/3684-1/
- https://usn.ubuntu.com/3684-2/
- https://www.debian.org/security/2018/dsa-4226
- https://www.oracle.com/security-alerts/cpujul2020.html