GLSA 200512-09: cURL: Off-by-one errors in URL handling

Severity:low
Title:cURL: Off-by-one errors in URL handling
Date:12/16/2005
Bugs: #114710
ID:200512-09

Synopsis

cURL is vulnerable to local arbitrary code execution via buffer overflow due to the insecure parsing of URLs.

Background

cURL is a command line tool for transferring files with URL syntax, supporting numerous protocols.

Affected packages

Package Vulnerable Unaffected Architecture(s)
net-misc/curl < 7.15.1 >= 7.15.1 All supported architectures

Description

Stefan Esser from the Hardened-PHP Project has reported a vulnerability in cURL that allows for a local buffer overflow when cURL attempts to parse specially crafted URLs. The URL can be specially crafted in one of two ways: the URL could be malformed in a way that prevents a terminating null byte from being added to either a hostname or path buffer; or the URL could contain a "?" separator in the hostname portion, which causes a "/" to be prepended to the resulting string.

Impact

An attacker capable of getting cURL to parse a maliciously crafted URL could cause a denial of service or execute arbitrary code with the privileges of the user making the call to cURL. An attacker could also escape open_basedir or safe_mode pseudo-restrictions when exploiting this problem from within a PHP program when PHP is compiled with libcurl.

Workaround

There is no known workaround at this time.

Resolution

All cURL users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/curl-7.15.1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200512-09.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

License

Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

Thank you!