CVE-2021-3711
This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 87.8%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the "out" parameter can be NULL and, on exit, the "outlen" parameter is populated with the buffer size required to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the "out" parameter. A bug in the implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a second time with a buffer that is too small. A malicious attacker who is able present SM2 content for decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of 62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour or causing the application to crash. The location of the buffer is application dependent but is typically heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k).
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 87.82% probability · 100th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-120
- Affected
- openssl/openssl · debian/debian linux · netapp/active iq unified manager · netapp/clustered data ontap · netapp/clustered data ontap antivirus connector · netapp/e-series santricity os controller · netapp/hci management node · netapp/manageability software development kit · netapp/oncommand insight · netapp/oncommand workflow automation · netapp/santricity smi-s provider · netapp/snapcenter · netapp/solidfire · netapp/storage encryption · oracle/communications cloud native core security edge protection proxy · oracle/communications cloud native core unified data repository · oracle/communications session border controller · oracle/communications unified session manager · oracle/enterprise communications broker · oracle/enterprise session border controller · +11 more
- Source
- openssl-security@openssl.org
References
- http://www.openwall.com/lists/oss-security/2021/08/26/2Mailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfThird Party Advisory
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=59f5e75f3bced8fc0e130d72a3f582cf7b480b46
- https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e5805a713d1%40%3Cdev.tomcat.apache.org%3E
- https://security.gentoo.org/glsa/202209-02Third Party Advisory
- https://security.gentoo.org/glsa/202210-02Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0010/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211022-0003/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://www.debian.org/security/2021/dsa-4963Third Party Advisory
- https://www.openssl.org/news/secadv/20210824.txtVendor Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- https://www.tenable.com/security/tns-2021-16Third Party Advisory
- https://www.tenable.com/security/tns-2022-02Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/08/26/2Mailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfThird Party Advisory
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=59f5e75f3bced8fc0e130d72a3f582cf7b480b46
- https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e5805a713d1%40%3Cdev.tomcat.apache.org%3E
- https://security.gentoo.org/glsa/202209-02Third Party Advisory
- https://security.gentoo.org/glsa/202210-02Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0010/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211022-0003/Third Party Advisory
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://www.debian.org/security/2021/dsa-4963Third Party Advisory
- https://www.openssl.org/news/secadv/20210824.txtVendor Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.