var-200505-0198
Vulnerability from variot

Multiple stack-based buffer overflows in libcURL and cURL 7.12.1, and possibly other versions, allow remote malicious web servers to execute arbitrary code via base64 encoded replies that exceed the intended buffer lengths when decoded, which is not properly handled by (1) the Curl_input_ntlm function in http_ntlm.c during NTLM authentication or (2) the Curl_krb_kauth and krb4_auth functions in krb4.c during Kerberos authentication. cURL/libcURL 7.13.0 Previously, Kerberos Authentication and NTLM from the site performing the authentication. It has been reported that cURL and libcURL are vulnerable to a remotely exploitable stack-based buffer overflow vulnerability. The cURL and libcURL NTML response processing code fails to ensure that a buffer overflow cannot occur when response data is decoded. The overflow occurs in the stack region, and remote code execution is possible if the saved instruction pointer is overwritten with a pointer to embedded instructions.

Background

curl is a command line tool for transferring files via many different protocols.

Affected packages

-------------------------------------------------------------------
 Package        /  Vulnerable  /                        Unaffected
-------------------------------------------------------------------

1 net-misc/curl < 7.13.1 >= 7.13.1

Description

curl fails to properly check boundaries when handling NTLM authentication.

Impact

With a malicious server an attacker could send a carefully crafted NTLM response to a connecting client leading to the execution of arbitrary code with the permissions of the user running curl.

Workaround

Disable NTLM authentication by not using the --anyauth or --ntlm options.

Resolution

All curl users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/curl-7.13.1"

References

[ 1 ] CAN-2005-0490 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0490

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200503-20.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 http://bugs.gentoo.org.

License

Copyright 2005 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.

http://creativecommons.org/licenses/by-sa/2.0

Show details on source website


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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