CVE-2015-1350

The VFS subsystem in the Linux kernel 3.x provides an incomplete set of requirements for setattr operations that underspecifies removing extended privilege attributes, which allows local users to cause a denial of service (capability stripping) via a failed invocation of a system call, as demonstrated by using chown to remove a capability from the ping or Wireshark dumpcap program.

Weakness

The product makes files or directories accessible to unauthorized actors, even though they should not be.

Affected Software

Extended Description

Web servers, FTP servers, and similar servers may store a set of files underneath a “root” directory that is accessible to the server’s users. Applications may store sensitive files underneath this root without also using access control to limit which users may request those files, if any. Alternately, an application might package multiple files or directories into an archive file (e.g., ZIP or tar), but the application might not exclude sensitive files that are underneath those directories. In cloud technologies and containers, this weakness might present itself in the form of misconfigured storage accounts that can be read or written by a public or anonymous user.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/150.html
• https://cwe.mitre.org/data/definitions/639.html

References

• http://marc.info/?l=linux-kernel\u0026m=142153722930533\u0026w=2
• http://www.openwall.com/lists/oss-security/2015/01/24/5
• http://www.securityfocus.com/bid/76075
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770492
• https://bugzilla.redhat.com/show_bug.cgi?id=1185139