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分析対象脆弱性情報 (リビジョン番号 : 1) [ Download XML ] 
VRDA-100118-001
OpenSSL の "CRYPTO_free_all_ex_data()" におけるメモリリークの問題
http://cvs.openssl.org/chngview?cn=19068

Modify compression code so it frees up structures without using the ex_data callbacks. This works around a problem where some applications call CRYPTO_free_all_ex_data() before application exit (e.g. when restarting) then use compression (e.g. SSL with compression) later. This results in significant per-connection memory leaks and has caused some security issues including CVE-2008-1678 and CVE-2009-4355.




この情報について
分析情報提供元:
 		JPCERT/CC
 		初版公開日:
 		2010-01-18
分析対象脆弱性情報の分類:
 		アドバイザリ・注意喚起
 		最終更新日:
 		2010-01-18




脆弱性の影響を受ける製品の識別子
cpe:/a:openssl:openssl     (OpenSSL Project OpenSSL)
 


脆弱性の分析内容
[分析に利用した情報の信頼性] [?]
低 [?]

中 [?]
X 高 [?]
[影響の大きさ] [?]
小 [?]

X 小～中 [?]
中～大 [?]
大 [?]
[攻撃経路] [?]
物理アクセス [?]

ローカルマシン上 [?]
同一セグメント上 [?]
X インターネット経由 [?]
[認証レベル] [?]
管理者アカウント [?]

一般ユーザアカウント [?]
フリーアカウント [?]
X 不要 [?]
[攻撃成立に必要なユーザの関与] [?]
X 複雑 [?]

簡単 [?]
不要 [?]
[攻撃の難易度] [?]
高 [?]

中～高 [?]
低～中 [?]
低 [?]
[対策の有無] [?]
公式パッチ有り [?]

X 公式回避策有り [?]
非公式回避策・パッチ有り [?]
なし [?]
[インシデントの発生状況] [?]
X 活動なし [?]

Exploit/PoCあり [?]
活動あり [?]
関連情報




参考情報
Common Vulnerabilities and Exposures (CVE) CVE-2009-4355
Memory leak in the zlib_stateful_finish function incrypto/comp/c_zlib.c in OpenSSL 0.9.8l and earlier and 1.0.0 Betathrough Beta 4 allows remote attackers to cause a denial of service(memory consumption) via vectors that trigger incorrect calls to theCRYPTO_free_all_ex_data function, as demonstrated by use of SSLv3 andPHP with the Apache HTTP Server, a related issue to CVE-2008-1678.




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