squid-3.5.20-15.el7.1
エラータID: AXSA:2020-050:02
リリース日:
2020/05/06 Wednesday - 16:55
題名:
squid-3.5.20-15.el7.1
影響のあるチャネル:
Asianux Server 7 for x86_64
Severity:
High
Description:
以下項目について対処しました。
[Security Fix]
- Squid には、ESI が有効な場合にオーバーフローのチェック
を行わないことによる、スタックオーバーフローの脆弱性が
あります。(CVE-2019-12519)
- Squid の Digest 認証には、Proxy-Authorization ヘッダに
おける引用符の扱いに誤りがあり、メモリ破壊の脆弱性が
あります。(CVE-2019-12525)
- Squid の Digest 認証には、盗聴された nonce を用いた
リプレイ攻撃によって、攻撃者に禁止されたリソースへの
アクセスを許す、あるいは、リモートからのコードの実行が
可能になる脆弱性があります。(CVE-2020-11945)
一部CVEの翻訳文はJVNからの引用になります。
http://jvndb.jvn.jp/
解決策:
パッケージをアップデートしてください。
CVE:
CVE-2019-12519
An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.
An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.
CVE-2019-12525
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
CVE-2020-11945
An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).
An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).
追加情報:
N/A
ダウンロード:
SRPMS
- squid-3.5.20-15.el7.1.src.rpm
MD5: 3a0cba3fa4e5e58e6c9773d263be4237
SHA-256: 83248215c0209a7b9321fbe7d0efeefacad38b9836c17644bf897b07a7a2f56a
Size: 2.32 MB
Asianux Server 7 for x86_64
- squid-3.5.20-15.el7.1.x86_64.rpm
MD5: 0a6fad34c9ae1246dc13f2c4996946af
SHA-256: 493acac79c66ba318e284f02d94f3827dfd0f6b4cebd45a4466c6f7838df2261
Size: 3.13 MB - squid-migration-script-3.5.20-15.el7.1.x86_64.rpm
MD5: 7c49371d744b6af20d3ff583fb1df12b
SHA-256: 308e9c2994fff96dfd78f2101e71c83317d531bd88f7609e852983947291a879
Size: 48.77 kB
English