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In December 2019, openssl.org released a security advisory [1] detailing an overflow bug in the x64_64 Montgomery squaring procedure issue. The following vulnerability may affect the TLS/SSL data plane of ACOS devices and is addressed in this document.
| Item# | Vulnerability ID | Score Source | Score | Summary |
| 1 | CVE-2019-1551 | CVSS 3.0 | 4.8 Medium | openssl: Integer overflow in RSAZ modular exponentiation on x86_64 [2] |
The table below indicates releases of ACOS exposed to this vulnerability and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.
Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.
| Releases Affected | Releases Resolved or Unaffected |
|---|---|
| 5.2.0 - 5.2.1 | 5.2.1-P1 |
| 5.0.0 - 5.1.0-P4 | 5.1.0-P5 |
| 4.1.4 - 4.1.4-GR1-P2 | 4.1.4-GR1-P3, 5.1.0-P3 |
| 4.1.1 - 4.1.1-P12 | 4.1.1-P13 |
None
Software updates that address these vulnerabilities are or will be published at the following URL:
http://www.a10networks.com/support/axseries/software-downloads
The following table shares brief descriptions for the vulnerabilities addressed in this document.
| Vulnerability ID | Vulnerability Description |
|---|---|
| CVE-2019-1551 |
There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e-dev (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u-dev (Affected 1.0.2-1.0.2t). |
| Ref # | General Link |
|---|---|
| [1] | OpenSSL Security Advisory [6 December 2019] |
| [2] | NIST NVD, CVE-2019-1551 |
None
| Revision | Date | Description |
|---|---|---|
| 1.0 | Wednesday, March 4th, 2020 |
Initial Publication |
| 1.1 | Thursday, March 5th, 2020 |
Typo correction |
| 2.0 | Monday, August 16th, 2021 |
Add resolved releases for 5.2.1, update 5.1.0 |
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