Heap-based buffer overflow in the proxy_connect function in src/client.c in CVS 1.11 and 1.12 allows remote HTTP proxy servers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted HTTP response.

The remote host is affected by the vulnerability described in GLSA-201701-44 (CVS: Heap-based overflow)

    A heap-based buffer overflow was discovered in the proxy_connect       function in src/client.c in CVS.
  Impact :

    An attacker, utilizing a remote HTTP proxy server, could cause a Denial       of Service condition or possibly execute arbitrary code via a crafted       HTTP response.
  Workaround :

    There is no known workaround at this time.

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

  - Heap-based buffer overflow in the proxy_connect function     in src/client.c in CVS 1.11 and 1.12 allows remote HTTP     proxy servers to cause a denial of service (crash) and     possibly execute arbitrary code via a crafted HTTP     response. (CVE-2012-0804)

A heap-based buffer overflow flaw was found in the way CVS read proxy connection HTTP responses. An attacker could exploit this to cause the application to crash or, potentially, execute arbitrary code in the context of the user running the application (CVE-2012-0804).

cvs was prone to a heap-based buffer overflow in the client side proxy handling

A heap-based buffer overflow flaw was found in the way the CVS client handled responses from HTTP proxies. A malicious HTTP proxy could use this flaw to cause the CVS client to crash or, possibly, execute arbitrary code with the privileges of the user running the CVS client.
(CVE-2012-0804)

From Red Hat Security Advisory 2012:0321 :

Updated cvs packages that fix one security issue are now available for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Concurrent Version System (CVS) is a version control system that can record the history of your files.

A heap-based buffer overflow flaw was found in the way the CVS client handled responses from HTTP proxies. A malicious HTTP proxy could use this flaw to cause the CVS client to crash or, possibly, execute arbitrary code with the privileges of the user running the CVS client.
(CVE-2012-0804)

All users of cvs are advised to upgrade to these updated packages, which contain a patch to correct this issue.

Concurrent Version System (CVS) is a version control system that can record the history of your files.

A heap-based buffer overflow flaw was found in the way the CVS client handled responses from HTTP proxies. A malicious HTTP proxy could use this flaw to cause the CVS client to crash or, possibly, execute arbitrary code with the privileges of the user running the CVS client.
(CVE-2012-0804)

All users of cvs are advised to upgrade to these updated packages, which contain a patch to correct this issue.

A vulnerability has been found and corrected in cvs :

A heap-based buffer overflow flaw was found in the way the CVS client handled responses from HTTP proxies. A malicious HTTP proxy could use this flaw to cause the CVS client to crash or, possibly, execute arbitrary code with the privileges of the user running the CVS client (CVE-2012-0804).

The updated packages have been patched to correct this issue.

A heap-based buffer overflow flaw was found in the way CVS read proxy connection HTTP responses. An attacker could exploit this to cause the application to crash or, potentially, execute arbitrary code in the context of the user running the application. (CVE-2012-0804)

Updated cvs packages that fix one security issue are now available for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Concurrent Version System (CVS) is a version control system that can record the history of your files.

A heap-based buffer overflow flaw was found in the way the CVS client handled responses from HTTP proxies. A malicious HTTP proxy could use this flaw to cause the CVS client to crash or, possibly, execute arbitrary code with the privileges of the user running the CVS client.
(CVE-2012-0804)

All users of cvs are advised to upgrade to these updated packages, which contain a patch to correct this issue.

It was discovered that cvs incorrectly handled certain responses from proxy servers. If a user were tricked into connecting to a malicious proxy server, a remote attacker could cause cvs to crash, or possibly execute arbitrary code.

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 CVE-2012-0804 (Client heap-based buffer overflow on bad proxy response)

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.

It was discovered that a malicious CVS server could cause a heap overflow in the CVS client, potentially allowing the server to execute arbitrary code on the client.

ID	Name	Product	Family	Severity
96641	GLSA-201701-44 : CVS: Heap-based overflow	Nessus	Gentoo Local Security Checks	critical
80598	Oracle Solaris Third-Party Patch Update : cvs (cve_2012_0804_buffer_errors)	Nessus	Solaris Local Security Checks	critical
75808	openSUSE Security Update : cvs (openSUSE-SU-2012:0310-1)	Nessus	SuSE Local Security Checks	critical
74556	openSUSE Security Update : cvs (openSUSE-2012-133)	Nessus	SuSE Local Security Checks	critical
69658	Amazon Linux AMI : cvs (ALAS-2012-51)	Nessus	Amazon Linux Local Security Checks	critical
68486	Oracle Linux 5 / 6 : cvs (ELSA-2012-0321)	Nessus	Oracle Linux Local Security Checks	critical
61260	Scientific Linux Security Update : cvs on SL5.x, SL6.x i386/x86_64 (20120221)	Nessus	Scientific Linux Local Security Checks	critical
58531	Mandriva Linux Security Advisory : cvs (MDVSA-2012:044)	Nessus	Mandriva Local Security Checks	critical
58142	SuSE 10 Security Update : CVS (ZYPP Patch Number 7991)	Nessus	SuSE Local Security Checks	critical
58140	SuSE 11.1 Security Update : CVS (SAT Patch Number 5860)	Nessus	SuSE Local Security Checks	critical
58108	CentOS 5 / 6 : cvs (CESA-2012:0321)	Nessus	CentOS Local Security Checks	critical
58104	Ubuntu 10.04 LTS / 10.10 / 11.04 / 11.10 : cvs vulnerability (USN-1371-1)	Nessus	Ubuntu Local Security Checks	critical
58083	RHEL 5 / 6 : cvs (RHSA-2012:0321)	Nessus	Red Hat Local Security Checks	critical
57966	Fedora 15 : cvs-1.11.23-17.fc15 (2012-1400)	Nessus	Fedora Local Security Checks	critical
57965	Fedora 16 : cvs-1.11.23-22.fc16 (2012-1383)	Nessus	Fedora Local Security Checks	critical
57880	Debian DSA-2407-1 : cvs - heap overflow	Nessus	Debian Local Security Checks	critical

Detections

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CVE-2012-0804

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