CVE-2017-3738

NameCVE-2017-3738
DescriptionThere is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-4065-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)buster1.1.1n-0+deb10u3fixed
buster (security)1.1.1n-0+deb10u6fixed
bullseye1.1.1w-0+deb11u1fixed
bullseye (security)1.1.1n-0+deb11u5fixed
bookworm, bookworm (security)3.0.11-1~deb12u2fixed
trixie3.1.5-1fixed
sid3.1.5-1.1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsourcewheezy(not affected)
opensslsourcejessie(not affected)
opensslsourcestretch1.1.0f-3+deb9u2
opensslsource(unstable)1.1.0h-1low
openssl1.0sourcestretch1.0.2l-2+deb9u2DSA-4065-1
openssl1.0source(unstable)1.0.2n-1low

Notes

[jessie] - openssl <not-affected> (Vulnerable code not present)
[wheezy] - openssl <not-affected> (Vulnerable code not present)
https://www.openssl.org/news/secadv/20171207.txt
OpenSSL_1_1_0-stable: https://git.openssl.org/?p=openssl.git;a=commit;h=e502cc86df9dafded1694fceb3228ee34d11c11a
OpenSSL_1_0_2-stable: https://git.openssl.org/?p=openssl.git;a=commit;h=ca51bafc1a88d8b8348f5fd97adc5d6ca93f8e76

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