Test Kennung:	1.3.6.1.4.1.25623.1.0.64109
Kategorie:	Debian Local Security Checks
Titel:	Debian Security Advisory DSA 1807-1 (cyrus-sasl2, cyrus-sasl2-heimdal)
Zusammenfassung:	NOSUMMARY
Beschreibung:	Description: The remote host is missing an update to cyrus-sasl2, cyrus-sasl2-heimdal announced via advisory DSA 1807-1. James Ralston discovered that the sasl_encode64() function of cyrus-sasl2, a free library implementing the Simple Authentication and Security Layer, suffers from a missing null termination in certain situations. This causes several buffer overflows in situations where cyrus-sasl2 itself requires the string to be null terminated which can lead to denial of service or arbitrary code execution. Important notice (Quoting from US-CERT): While this patch will fix currently vulnerable code, it can cause non-vulnerable existing code to break. Here's a function prototype from include/saslutil.h to clarify my explanation: /* base64 encode * in -- input data * inlen -- input data length * out -- output buffer (will be NUL terminated) * outmax -- max size of output buffer * result: * outlen -- gets actual length of output buffer (optional) * * Returns SASL_OK on success, SASL_BUFOVER if result won't fit */ LIBSASL_API int sasl_encode64(const char *in, unsigned inlen, char *out, unsigned outmax, unsigned *outlen) Assume a scenario where calling code has been written in such a way that it calculates the exact size required for base64 encoding in advance, then allocates a buffer of that exact size, passing a pointer to the buffer into sasl_encode64() as *out. As long as this code does not anticipate that the buffer is NUL-terminated (does not call any string-handling functions like strlen(), for example) the code will work and it will not be vulnerable. Once this patch is applied, that same code will break because sasl_encode64() will begin to return SASL_BUFOVER. For the oldstable distribution (etch), this problem will be fixed soon. For the stable distribution (lenny), this problem has been fixed in version 2.1.22.dfsg1-23+lenny1 of cyrus-sasl2 and cyrus-sasl2-heimdal. For the testing distribution (squeeze), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 2.1.23.dfsg1-1 of cyrus-sasl2 and cyrus-sasl2-heimdal. We recommend that you upgrade your cyrus-sasl2/cyrus-sasl2-heimdal packages. Solution: http://www.securityspace.com/smysecure/catid.html?in=DSA%201807-1 CVSS Score: 7.5 CVSS Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Querverweis:	Common Vulnerability Exposure (CVE) ID: CVE-2009-0688 http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html BugTraq ID: 34961 http://www.securityfocus.com/bid/34961 Cert/CC Advisory: TA10-103B http://www.us-cert.gov/cas/techalerts/TA10-103B.html CERT/CC vulnerability note: VU#238019 http://www.kb.cert.org/vuls/id/238019 Debian Security Information: DSA-1807 (Google Search) http://www.debian.org/security/2009/dsa-1807 http://security.gentoo.org/glsa/glsa-200907-09.xml http://www.mandriva.com/security/advisories?name=MDVSA-2009:113 http://osvdb.org/54514 http://osvdb.org/54515 https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10687 https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6136 http://www.redhat.com/support/errata/RHSA-2009-1116.html http://www.securitytracker.com/id?1022231 http://secunia.com/advisories/35094 http://secunia.com/advisories/35097 http://secunia.com/advisories/35102 http://secunia.com/advisories/35206 http://secunia.com/advisories/35239 http://secunia.com/advisories/35321 http://secunia.com/advisories/35416 http://secunia.com/advisories/35497 http://secunia.com/advisories/35746 http://secunia.com/advisories/39428 http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.448834 http://sunsolve.sun.com/search/document.do?assetkey=1-77-1020755.1-1 http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021699.1-1 http://sunsolve.sun.com/search/document.do?assetkey=1-66-259148-1 http://sunsolve.sun.com/search/document.do?assetkey=1-66-264248-1 http://sunsolve.sun.com/search/document.do?assetkey=1-66-273910-1 SuSE Security Announcement: SUSE-SR:2009:011 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00003.html http://www.ubuntu.com/usn/usn-790-1 http://www.vupen.com/english/advisories/2009/1313 http://www.vupen.com/english/advisories/2009/2012 XForce ISS Database: solaris-sasl-saslencode64-bo(50554) https://exchange.xforce.ibmcloud.com/vulnerabilities/50554
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