The directory-services functionality in the scheduler in CUPS 1.1.17 and 1.1.22 allows remote attackers to cause a denial of service (cupsd daemon outage or crash) via manipulations of the timing of CUPS browse packets, related to a "pointer use-after-delete flaw."

From Red Hat Security Advisory 2009:1083 :

Updated cups packages that fix multiple security issues are now available for Red Hat Enterprise Linux 3 and 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

The Common UNIX(r) Printing System (CUPS) provides a portable printing layer for UNIX operating systems. The Internet Printing Protocol (IPP) allows users to print and manage printing-related tasks over a network. The CUPS 'pdftops' filter converts Portable Document Format (PDF) files to PostScript. 'pdftops' is based on Xpdf and the CUPS imaging library.

A NULL pointer dereference flaw was found in the CUPS IPP routine, used for processing incoming IPP requests for the CUPS scheduler. An attacker could use this flaw to send specially crafted IPP requests that would crash the cupsd daemon. (CVE-2009-0949)

A use-after-free flaw was found in the CUPS scheduler directory services routine, used to process data about available printers and printer classes. An attacker could use this flaw to cause a denial of service (cupsd daemon stop or crash). (CVE-2009-1196)

Multiple integer overflows flaws, leading to heap-based buffer overflows, were found in the CUPS 'pdftops' filter. An attacker could create a malicious PDF file that would cause 'pdftops' to crash or, potentially, execute arbitrary code as the 'lp' user if the file was printed. (CVE-2009-0791)

Red Hat would like to thank Anibal Sacco from Core Security Technologies for reporting the CVE-2009-0949 flaw, and Swen van Brussel for reporting the CVE-2009-1196 flaw.

Users of cups are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the cupsd daemon will be restarted automatically.

A NULL pointer dereference flaw was found in the CUPS IPP routine, used for processing incoming IPP requests for the CUPS scheduler. An attacker could use this flaw to send specially crafted IPP requests that would crash the cupsd daemon. (CVE-2009-0949)

A use-after-free flaw was found in the CUPS scheduler directory services routine, used to process data about available printers and printer classes. An attacker could use this flaw to cause a denial of service (cupsd daemon stop or crash). (CVE-2009-1196)

Multiple integer overflows flaws, leading to heap-based buffer overflows, were found in the CUPS 'pdftops' filter. An attacker could create a malicious PDF file that would cause 'pdftops' to crash or, potentially, execute arbitrary code as the 'lp' user if the file was printed. (CVE-2009-0791)

After installing this update, the cupsd daemon will be restarted automatically.

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2009:1083 advisory.

    The Common UNIX Printing System (CUPS) provides a portable printing layer     for UNIX operating systems. The Internet Printing Protocol (IPP) allows     users to print and manage printing-related tasks over a network. The CUPS     pdftops filter converts Portable Document Format (PDF) files to     PostScript. pdftops is based on Xpdf and the CUPS imaging library.

    A NULL pointer dereference flaw was found in the CUPS IPP routine, used for     processing incoming IPP requests for the CUPS scheduler. An attacker could     use this flaw to send specially-crafted IPP requests that would crash the     cupsd daemon. (CVE-2009-0949)

    A use-after-free flaw was found in the CUPS scheduler directory services     routine, used to process data about available printers and printer classes.
    An attacker could use this flaw to cause a denial of service (cupsd daemon     stop or crash). (CVE-2009-1196)

    Multiple integer overflows flaws, leading to heap-based buffer overflows,     were found in the CUPS pdftops filter. An attacker could create a     malicious PDF file that would cause pdftops to crash or, potentially,     execute arbitrary code as the lp user if the file was printed.
    (CVE-2009-0791)

    Red Hat would like to thank Anibal Sacco from Core Security Technologies     for reporting the CVE-2009-0949 flaw, and Swen van Brussel for reporting     the CVE-2009-1196 flaw.

    Users of cups are advised to upgrade to these updated packages, which     contain backported patches to correct these issues. After installing this     update, the cupsd daemon will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Updated cups packages that fix multiple security issues are now available for Red Hat Enterprise Linux 3 and 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

The Common UNIX(r) Printing System (CUPS) provides a portable printing layer for UNIX operating systems. The Internet Printing Protocol (IPP) allows users to print and manage printing-related tasks over a network. The CUPS 'pdftops' filter converts Portable Document Format (PDF) files to PostScript. 'pdftops' is based on Xpdf and the CUPS imaging library.

A NULL pointer dereference flaw was found in the CUPS IPP routine, used for processing incoming IPP requests for the CUPS scheduler. An attacker could use this flaw to send specially crafted IPP requests that would crash the cupsd daemon. (CVE-2009-0949)

A use-after-free flaw was found in the CUPS scheduler directory services routine, used to process data about available printers and printer classes. An attacker could use this flaw to cause a denial of service (cupsd daemon stop or crash). (CVE-2009-1196)

Multiple integer overflows flaws, leading to heap-based buffer overflows, were found in the CUPS 'pdftops' filter. An attacker could create a malicious PDF file that would cause 'pdftops' to crash or, potentially, execute arbitrary code as the 'lp' user if the file was printed. (CVE-2009-0791)

Red Hat would like to thank Anibal Sacco from Core Security Technologies for reporting the CVE-2009-0949 flaw, and Swen van Brussel for reporting the CVE-2009-1196 flaw.

Users of cups are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the cupsd daemon will be restarted automatically.

ID	Name	Product	Family	Severity
67868	Oracle Linux 3 / 4 : cups (ELSA-2009-1083)	Nessus	Oracle Linux Local Security Checks	medium
60592	Scientific Linux Security Update : cups on SL3.x, SL4.x, SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
39307	RHEL 4 : cups (RHSA-2009:1083)	Nessus	Red Hat Local Security Checks	high
39303	CentOS 3 / 4 : cups (CESA-2009:1083)	Nessus	CentOS Local Security Checks	medium

Detections

Analytics

CVE-2009-1196

high

Tenable Plugins

medium

medium

high

medium