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CVE-2019-1551

Publication date 6 December 2019

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

5.3 · Medium

Score breakdown

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 (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).

Read the notes from the security team

Status

Package Ubuntu Release Status
edk2 20.04 LTS focal
Not affected
19.10 eoan
Not affected
19.04 disco Ignored end of life
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty Not in release
nodejs 20.04 LTS focal
Not affected
19.10 eoan
Not affected
19.04 disco
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
openssl 20.04 LTS focal
Fixed 1.1.1f-1ubuntu1
19.10 eoan
Fixed 1.1.1c-1ubuntu4.1
19.04 disco Ignored end of life
18.04 LTS bionic
Fixed 1.1.1-1ubuntu2.1~18.04.6
16.04 LTS xenial
Fixed 1.0.2g-1ubuntu4.16
14.04 LTS trusty
Not affected
openssl1.0 20.04 LTS focal Not in release
19.10 eoan Not in release
19.04 disco Not in release
18.04 LTS bionic
Fixed 1.0.2n-1ubuntu5.4
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

Notes

mdeslaur

affected file isn't built in edk2

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
openssl

Severity score breakdown

Parameter Value
Base score 5.3 · Medium
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-4504-1
    • OpenSSL vulnerabilities
    • 16 September 2020

Other references