Heap-based buffer overflow in PolarSSL 1.x before 1.2.17 and ARM mbed TLS (formerly PolarSSL) 1.3.x before 1.3.14 and 2.x before 2.1.2 allows remote SSL servers to cause a denial of service (client crash) and possibly execute arbitrary code via a long hostname to the server name indication (SNI) extension, which is not properly handled when creating a ClientHello message. NOTE: this identifier has been SPLIT per ADT3 due to different affected version ranges. See CVE-2015-8036 for the session ticket issue that was introduced in 1.3.0.

The remote host is affected by the vulnerability described in GLSA-201706-18 (mbed TLS: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in mbed TLS. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could possibly execute arbitrary code with the       privileges of the process, or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

- Update to 2.1.2 - CVE-2015-5291 Release notes:
    https://tls.mbed.org/tech-     updates/releases/mbedtls-2.1.2-and-1.3.14-and-polarssl-1     .2.17-released Security notes:
    https://tls.mbed.org/tech-updates/security-advisories/mb     edtls-security- advisory-2015-01

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.

- Update to 1.3.14 - CVE-2015-5291 Release notes:
    https://tls.mbed.org/tech-     updates/releases/mbedtls-2.1.2-and-1.3.14-and-polarssl-1     .2.17-released Security notes:
    https://tls.mbed.org/tech-updates/security-advisories/mb     edtls-security- advisory-2015-01

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 polarssl, a library providing SSL and TLS support, contained two heap-based buffer overflows that could allow a remote attacker to trigger denial of service (via application crash) or arbitrary code execution.

This update for polarssl fixes the following security issue :

  - CVE-2015-5291: Remote code execution via session tickets     or SNI (boo#949380)

This update for mbedtls fixes the following security and non-security issues :

  - Update to 1.3.15

  - Fix potential double free if ssl_set_psk() is called     more than once and some allocation fails. Cannot be     forced remotely. Found by Guido Vranken, Intelworks.

  - Fix potential heap corruption on windows when     x509_crt_parse_path() is passed a path longer than 2GB.
    Cannot be triggered remotely. Found by Guido Vranken,     Intelworks.

  - Fix potential buffer overflow in some asn1_write_xxx()     functions. Cannot be triggered remotely unless you     create X.509 certificates based on untrusted input or     write keys of untrusted origin. Found by Guido Vranken,     Intelworks.

  - The x509 max_pathlen constraint was not enforced on     intermediate certificates. Found by Nicholas Wilson, fix     and tests provided by Janos Follath. #280 and #319

  - Self-signed certificates were not excluded from pathlen     counting, resulting in some valid X.509 being     incorrectly rejected. Found and fix provided by Janos     Follath. #319

  - Fix bug causing some handshakes to fail due to some     non-fatal alerts not begin properly ignored. Found by     mancha and Kasom Koht-arsa, #308

  - Fix build error with configurations where ecdhe-psk is     the only key exchange. Found and fix provided by Chris     Hammond. #270

  - Fix failures in mpi on sparc(64) due to use of bad     assembly code. Found by Kurt Danielson. #292

  - Fix typo in name of the extkeyusage oid. found by     inestlerode, #314

  - Fix bug in asn.1 encoding of booleans that caused     generated ca certificates to be rejected by some     applications, including OS X Keychain. Found and fixed     by Jonathan Leroy, Inikup.

  - Fix 'destination buffer is too small' error in     cert_write program. Found and fixed by Jonathan Leroy,     Inikup.

  - Update to 1.3.14

  - Added fix for CVE-2015-5291 (boo#949380) to prevent heap     corruption due to buffer overflow of the hostname or     session ticket. Found by Guido Vranken, Intelworks.

  - Fix stack-based buffer overflow in pkcs12 decryption     (used by mbedtls_pk_parse_key(file)() when the password     is > 129 bytes. Found by Guido Vranken, Intelworks. Not     triggerable remotely.

  - Fix potential buffer overflow in     mbedtls_mpi_read_string(). Found by Guido Vranken,     Intelworks. Not exploitable remotely in the context of     TLS, but might be in other uses. On 32 bit machines,     requires reading a string of close to or larger than 1GB     to exploit; on 64 bit machines, would require reading a     string of close to or larger than 2^62 bytes.

  - Fix potential random memory allocation in     mbedtls_pem_read_buffer() on crafted PEM input data.
    Found and fix provided by Guido Vranken, Intelworks. Not     triggerable remotely in TLS. Triggerable remotely if you     accept PEM data from an untrusted source.

  - Fix potential double-free if ssl_set_psk() is called     repeatedly on the same ssl_context object and some     memory allocations fail. Found by Guido Vranken,     Intelworks. Can not be forced remotely.

  - Fix possible heap buffer overflow in base64_encode()     when the input buffer is 512MB or larger on 32-bit     platforms. Found by Guido Vranken, Intelworks. Found by     Guido Vranken. Not trigerrable remotely in TLS.

  - Fix potential heap buffer overflow in servers that     perform client authentication against a crafted CA cert.
    Cannot be triggered remotely unless you allow third     parties to pick trust CAs for client auth. Found by     Guido Vranken, Intelworks.

  - Fix compile error in net.c with musl libc. found and     patch provided by zhasha (#278).

  - Fix macroization of 'inline' keywork when building as     c++. (#279)

  - Added checking of hostname length in ssl_set_hostname()     to ensure domain names are compliant with RFC 1035.

  - Changes for 1.3.13

  - Fix possible client-side NULL pointer dereference (read)     when the client tries to continue the handshake after it     failed (a misuse of the API). (Found and patch provided     by Fabian Foerg, Gotham Digital Science using afl-fuzz.)

  - Add countermeasure against lenstra's rsa-crt attack for     pkcs#1 v1.5 signatures. (Found by Florian Weimer, Red     Hat.)     https://securityblog.redhat.com/2015/09/02/factoring-rsa
    -keys-with-tls-perfect-forward-secrecy/

  - Setting ssl_min_dhm_bytes in config.h had no effect     (overriden in ssl.h) (found by Fabio Solari) (#256)

  - Fix bug in mbedtls_rsa_public() and     mbedtls_rsa_private() that could result trying to unlock     an unlocked mutex on invalid input (found by Fredrik     Axelsson) (#257)

  - Fix -wshadow warnings (found by hnrkp) (#240)

  - Fix unused function warning when using mbedtls_mdx_alt     or MBEDTLS_SHAxxx_ALT (found by Henrik) (#239)

  - Fix memory corruption in pkey programs (found by     yankuncheng) (#210)

  - Fix memory corruption on client with overlong psk     identity, around SSL_MAX_CONTENT_LEN or higher - not     triggerrable remotely (found by Aleksandrs Saveljevs)     (#238)

  - Fix off-by-one error in parsing supported point format     extension that caused some handshakes to fail.

  - When verifying a certificate chain, if an intermediate     certificate is trusted, no later cert is checked.
    (suggested by hannes-landeholm) (#220).

  - Changes for 1.3.12

  - Increase the minimum size of diffie-hellman parameters     accepted by the client to 1024 bits, to protect against     Logjam attack.

  - Increase the size of default diffie-hellman parameters     on the server to 2048 bits. This can be changed with     ssl_set_dh_params().

  - Fix thread-safety issue in ssl debug module (found by     edwin van vliet).

  - Some example programs were not built using make, not     included in visual Studio projects (found by Kristian     Bendiksen).

  - Fix build error with cmake and pre-4.5 versions of gcc     (found by hugo Leisink).

  - Fix missing -static-ligcc when building shared libraries     for windows with make.

  - Fix compile error with armcc5 --gnu.

  - Add ssl_min_dhm_bytes configuration parameter in     config.h to choose the minimum size of Diffie-Hellman     parameters accepted by the client.

  - The pem parser now accepts a trailing space at end of     lines (#226).

A flaw was found in PolarSSl and mbed TLS :

When the client creates its ClientHello message, due to insufficient bounds checking it can overflow the heap-based buffer containing the message while writing some extensions. Two extensions in particular could be used by a remote attacker to trigger the overflow: the session ticket extension and the server name indication (SNI) extension.

Although most of the vulnerable code is not present in the Squeeze version, this upload contains at least a length check for incoming data.

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

ARM Limited reports :

When the client creates its ClientHello message, due to insufficient bounds checking it can overflow the heap-based buffer containing the message while writing some extensions. Two extensions in particular could be used by a remote attacker to trigger the overflow : the session ticket extension and the server name indication (SNI) extension.

ID	Name	Product	Family	Severity
100944	GLSA-201706-18 : mbed TLS: Multiple vulnerabilities (SLOTH)	Nessus	Gentoo Local Security Checks	high
89440	Fedora 23 : mbedtls-2.1.2-1.fc23 (2015-e22bb33731)	Nessus	Fedora Local Security Checks	medium
89300	Fedora 22 : mbedtls-1.3.14-1.fc22 (2015-7f939b3af5)	Nessus	Fedora Local Security Checks	medium
89196	Fedora 21 : mbedtls-1.3.14-1.fc21 (2015-30a417bea9)	Nessus	Fedora Local Security Checks	medium
88602	Debian DSA-3468-1 : polarssl - security update	Nessus	Debian Local Security Checks	medium
87633	openSUSE Security Update : polarssl (openSUSE-2015-962)	Nessus	SuSE Local Security Checks	medium
87394	openSUSE Security Update : mbedtls (openSUSE-2015-898)	Nessus	SuSE Local Security Checks	medium
86552	Debian DLA-331-1 : polarssl security update	Nessus	Debian Local Security Checks	medium
86386	FreeBSD : mbedTLS/PolarSSL -- DoS and possible remote code execution (07a1a76c-734b-11e5-ae81-14dae9d210b8)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2015-5291

critical

Tenable Plugins

high

medium

medium

medium

medium

medium

medium

medium

medium