Stack-based buffer overflow in the url::get_pac function in url.cpp in libproxy 0.4.x before 0.4.9 allows remote servers to have an unspecified impact via a large proxy.pac file.

Tomas Hoger reports :

A buffer overflow flaw was discovered in the libproxy's url::get_pac() used to download proxy.pac proxy auto-configuration file. A malicious host hosting proxy.pac, or a man in the middle attacker, could use this flaw to trigger a stack-based buffer overflow in an application using libproxy, if proxy configuration instructed it to download proxy.pac file from a remote HTTP server.

The remote Solaris system is missing necessary patches to address security updates :

  - Stack-based buffer overflow in the url::get_pac function     in url.cpp in libproxy 0.4.x before 0.4.9 allows remote     servers to have an unspecified impact via a large     proxy.pac file. (CVE-2012-4504)

  - Heap-based buffer overflow in the px_pac_reload function     in lib/pac.c in libproxy 0.2.x and 0.3.x allows remote     servers to have an unspecified impact via a crafted     Content-Length size in an HTTP response header for a     proxy.pac file request, a different vulnerability than     CVE-2012-4504. (CVE-2012-4505)

This update of libproxy fixed a buffer overflow flaw.

The remote host is affected by the vulnerability described in GLSA-201404-02 (libproxy: User-assisted execution of arbitrary code)

    A boundary error when processing the proxy.pac file could cause a       stack-based buffer overflow.
  Impact :

    A man-in-the-middle attacker could provide a specially crafted proxy.pac       file on a remote server, possibly resulting in execution of arbitrary       code with the privileges of the process or a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

A vulnerability has been discovered and corrected in libproxy :

Stack-based buffer overflow in the url::get_pac function in url.cpp in libproxy 0.4.x before 0.4.9 allows remote servers to have an unspecified impact via a large proxy.pac file (CVE-2012-4504).

The updated packages have been patched to correct this issue.

Fix http chunk encoded PAC that was broken in previous release Add HTTP client unit test Fix coding style issues

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Tomas Mraz discovered that libproxy incorrectly handled certain PAC files. A remote attacker could use this issue to cause libproxy to crash, or to possibly execute arbitrary code. (CVE-2012-4504, CVE-2012-4505).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- Fix http chunk encoded PAC that was broken in previous     release

    - Add HTTP client unit test

    - Fix coding style issues

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
87982	FreeBSD : libproxy -- stack-based buffer overflow (3b5c2362-bd07-11e5-b7ef-5453ed2e2b49)	Nessus	FreeBSD Local Security Checks	critical
80675	Oracle Solaris Third-Party Patch Update : libproxy (multiple_buffer_errors_vulnerability_in1)	Nessus	Solaris Local Security Checks	critical
74787	openSUSE Security Update : libproxy / libproxy-plugins (openSUSE-SU-2012:1375-1)	Nessus	SuSE Local Security Checks	critical
73391	GLSA-201404-02 : libproxy: User-assisted execution of arbitrary code	Nessus	Gentoo Local Security Checks	critical
62972	Mandriva Linux Security Advisory : libproxy (MDVSA-2012:172)	Nessus	Mandriva Local Security Checks	critical
62952	Fedora 17 : libproxy-0.4.10-1.fc17 (2012-17574)	Nessus	Fedora Local Security Checks	critical
62899	Ubuntu 10.04 LTS / 11.10 / 12.04 LTS : libproxy vulnerabilities (USN-1629-1)	Nessus	Ubuntu Local Security Checks	critical
62873	Fedora 18 : libproxy-0.4.10-1.fc18 (2012-16383)	Nessus	Fedora Local Security Checks	critical

Detections

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CVE-2012-4504

critical

Tenable Plugins

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