OpenSSL "ssl3_get_key_exchange()" Use-after-free Vulnerability

2010-08-19 / 2010-08-20

Credit: Georgi Guninski

Risk: Medium

Local: No

Remote: Yes

CVE: CVE-2010-2939

CWE: CWE-Other

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: None

Availability impact: Partial

openssl-1.0.0a on ubuntu, debian and arch.

~/local/bin/openssl s_server -www -accept 8888 -cert /tmp/CA.cert  -key /tmp/CA.key

~/local/bin/openssl s_client -connect localhost:8888

depth=0 CN = CA
verify return:1
*** glibc detected *** /home/build/local/bin/openssl: double free or corruption (fasttop): 0x0000000000979300 ***

~/local/bin/openssl rsa -check -in /tmp/CA.key |more
writing RSA key
RSA key error: q not prime # definitely

-- 

References:

http://www.vupen.com/english/advisories/2010/2038

http://www.openwall.com/lists/oss-security/2010/08/11/6

http://www.mail-archive.com/openssl-dev@openssl.org/msg28049.html

http://www.mail-archive.com/openssl-dev@openssl.org/msg28045.html

http://www.mail-archive.com/openssl-dev@openssl.org/msg28043.html

http://securitytracker.com/id?1024296

http://secunia.com/advisories/40906

http://seclists.org/fulldisclosure/2010/Aug/84

See this note in RAW Version

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OpenSSL "ssl3_get_key_exchange()" Use-after-free Vulnerability

References:

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