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: | |
| 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:
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.